Northern Territory weeds dataset

Index:

Metadata
Citation
Description

Dataset Status
Data Quality
Contact Information
Data Dictionary
Supplementary Information

Metadata Details:

Name:AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile

Version:1.0

Date Metadata Extracted:2024-11-21

Date Metadata Last Updated:2024-10-07

Current URL (HTML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=CDC9FABDCF7A22CDE040CD9B21443996

Current URL (XML format) : http://www.ntlis.nt.gov.au/metadata/export_data?type=xml&metadata_id=CDC9FABDCF7A22CDE040CD9B21443996

Citation

ANZLIC Identifier:CDC9FABDCF7A22CDE040CD9B21443996

Title: Northern Territory weeds dataset

Citation Date:2003-06-01

Date Type:creation

Custodian:Department of Environment, Parks and Water Security

Description

Abstract:

There are two Northern Territory (NT) (presence and absence point) Weed Datasets describing the recorded weed status at a single point in time. The datasets are compiled from various weed surveys, including the publicly available WeedMate app. Some data is sourced from herbarium records, historical weed records and other types of surveys, including vegetation and land condition monitoring.

The NT Weed Datasets are largely a compilation of data derived from GPS locations attributed to describe weed species presence/absence, size, density, population demographics and treatments of those infestations. The datasets are used to assist the Weed Management Branch (WMB), Northern Territory Government (NTG) and other stakeholders to identify existing weed infestations and new incursions. This information is also used for weed management planning and to guide weed control and compliance programs.

The datasets are spatially located in Geocentric Datum of Australia 1994 (GDA94) datum as decimal degrees, and the file formats are ESRI Shapefile and file geodatabase. The data custodian is the Director of the Weed Management Branch.

It is important to note that weed infestations frequently change, either reducing with successful control or increasing where control programs are not in place. Accordingly, recorded observations are valid only for the date of the record. Further survey may be required to determine the current infestation status.

ANZLIC Search Words:

biota

environment

farming

Spatial Domain:

Bounding Coordinates:

North Bounding Coordinate:-10

South Bounding Coordinate:-26

East Bounding Coordinate:138

West Bounding Coordinate:129

Dataset Status

Dataset ID:

Language:English

Character Set: Latin 1

Progress:onGoing

Maintenance and Update Frequency:continual

Data Currency Start Date:2003-06-01

Data Currency End Date:2024-09-26

Access Constraint:Download the spatial data package (contains spatial data, Metadata and mapping information links, and data collection field guide and manual) via the NTG Open Data Portal data.nt.gov.au/

You are licensed to use the geospatial products on the terms and conditions set out in: Creative Commons Attribution 4.0 International Public License (CC BY 4.0) at: creativecommons.org/licenses/by/4.0/legalcode

If you do not agree to the terms and conditions you must not use the geospatial products.

You are free to copy, communicate and adapt the licensed material, provided that you abide by the licence terms (including Attribution) and attribute the licensed material using the statement:

Supplied by the Department of Lands, Planning and Environment. Copyright Northern Territory Government 2024.

Data Quality

Lineage:NT WMB adopted the 2006 national collection standards and converted all of its prior records. Over the intervening years, some of these core attributes have been slightly modified to current attributes defined in the Data Dictionary.
The weeds data is drawn from various datasets with differing accuracy levels. Attention should be given to the recording method (REC_METHOD) field as it can provide an indication of the survey method and subsequent positional accuracy and limitations.
NT_Weeds_Absence dataset contains the date of inspection of the named weed, which was searched for and not found. Reasons for recording an absence record is when a weed has been known to occur in an area and the weed is searched for and not found, or when an area is comprehensively searched to find either presence or absence of a specific weed and an absence is recorded along the survey path at set intervals if the weed is not observed. This dataset is available to the public on request.

Positional Accuracy:ositional accuracy is described by category for each record in the attribute REC_METHOD. Within each category the actual accuracy will vary as described below.

Single GPS....................Handheld GPS, typically accurate to between +/- 15 m to 5 m with technology advancement post May 2000, and can be typically 50 m pre May 2000 due to Selective Availability;
Averaged GPS...............Handheld GPS, held to average. Typically accurate to +/- 5 m;
Differential GPS.............GPS or survey equipment using base station or other correction systems. Typically accurate to +/- 10 cm;
Prior Record...................Method of positioning unknown. Typically accurate to +/- 100 m;
On-screen Digitised........Digitised on a GIS or Google earth background. Typically accurate to +/- 50 m;
Roadside survey..................Observation point using the roadside survey method is typically accurate to +/- 15 m, however the observed area can be up to 250 m;
Aerial survey.................Observed point using the aerial survey method is typically accurate to +/- 15 m; however the observed area can be up to 250 m;
Device apps..................There are various apps being used, including WeedMate (ESRI Survey123), Fulcrum, Avenza and Konect, typically accurate to +/- 5 m, however can be greater if insufficient time given for device satellite connections.

Attribute Accuracy:The majority of records have been created by authorised weeds officers and should be considered as highly reliable within the context of the record method used. Other reliable sources include early weed databases which were created and maintained by NTG agencies.
TAXONOMY, NAME CHANGES AND COMMON NAMES. Weed species are recorded with the taxonomic name which was valid at the time the data was submitted. The WMB maintains a taxonomic table of NT weeds which includes aliases, name changes and defines the recognised application of common name to species.
SPECIES AGGREGATES. Some species, for example: perennial and annual Mission grass (Cenchrus genus) are very similar and at times treated as a collective. Collectives where only one species of the collective is known to be present but it was not determined which species, sp is applied (e.g. Cenchrus sp). If more than one species of the collective is present at the time of inspection, spp is applied (e.g. Cenchrus spp).
MISSING DATE NOMENCLATURE. Records without an exact date are included in the dataset if they are deemed to be otherwise reliable. Where only a year of a weed record has been determined, the record's REC_DATE will be 1/1/XXXX, where XXXX is the year. For example, a record occurred sometime in 1986, it would be assigned 1/1/1986. Where a month and year can be determined, but not the day, the 1st of the month is used (e.g. 1/6/2020). Where neither the exact date nor the year can be determined, the record is assigned the date 1/1/1900.

Logical Consistency:Not documented

Completeness:Complete

Contacts

Name Organisation Position Role Phone Fax Email

Data Requests Officer Department of Environment, Parks and Water Security Geospatial Services Branch (on behalf of department) distributor datarequests.depws@nt.gov.au

Name	Organisation	Position	Role	Phone	Fax	Email
Data Requests Officer	Department of Environment, Parks and Water Security	Geospatial Services Branch (on behalf of department)	distributor			datarequests.depws@nt.gov.au

Data Dictionary

Attribute Attribute Description Possible Code Code Description

1.1 INDEX Unique record identifier, database generated.

Number is generated by hosting software and may be subject to re-indexing, cannot be relied upon as a reference to a record. The INDEX field is system dependent, may also be known as FID, OBJECT ID or ID.

1.2 SITE_ID Text (string), 15 characters

Waypoint ID or other similar source identifier for this record applied by the observer.

- This is not a unique identifier.
- The intention of this field is to assist in tracing a record back to its field observation source.
- Blank values can be entered. Null or empty string value designates no data value.

1.3 SITE_MON Text (string), 15 characters

Example DALY0001
Identifies spatially unique site with the intent of revisiting to monitor progress.

- This is not a unique identifier.
- Ideally, a monitoring protocol should be used in association with a site identified by this field.
- Blank values can be entered. Null or empty string value designates no data value.

2.1 WEED_NAME Text (string), 40 characters

Common name of the weed species.
Example: Gamba grass

- Values are case sensitive.

2.2 GENUS_SPP Text (string), 60 characters

Scientific or Botanical name of the weed species i.e. Genus species.
Example: Andropogon gayanus

- Blank values are not acceptable
- Values are case sensitive

3.1 DATE_REC Date

The date of the recorded observation.

Format: DD/MM/YYYY
Example: 12/03/2005

- Blank values are not acceptable

4.1 LAT_G94 Number (Double)

Example: -13.02345
The latitude (Y coordinate, determines North - South), identifying the location of the weed infestation site. This must be entered in Decimal Degrees ideally to 5 decimal places (equivalent to 1 metre on the ground). The location should be recorded in the centre of the weed infestation, if possible.

- Dataset is stored using the datum GDA94 (Geocentric Datum of Australia 1994)
- Blank values are not acceptable

4.2 LONG_G94 Number (Double)

Example: 131.45761
The longitude (X coordinate, determines East - West), identifying the location of the weed infestation site. This must be entered in Decimal Degrees ideally to 5 decimal places (equivalent to 1 metre on the ground). The location should be recorded in the centre of the weed infestation, if possible.

- Dataset is stored using the datum GDA94 (Geocentric Datum of Australia 1994)
- Blank values are not acceptable

4.3 REC_METHOD Text (string), 25 characters

Method used to define the weed infestation location. Current set values should be used wherever possible, historical set values have been retained for compatibility with existing record.

Example values:
Aerial spray
Aerial survey
Corridor survey
Roadside survey
Handheld GPS
Averaged GPS
Differential GPS
Avenza Maps
Fulcrum
Itracker device
Konect App
WeedMate

- Blank values are not acceptable

5.1 RECORDER Text (string), 40 characters

The name of the person responsible for capturing the weed data information. In the case of supervised teams the supervisor's name or generic group name (e.g. xx Rangers) should be entered against the data. Check previous submitted entries to maintain consistency of name.

- Field RECORDER and ORG_NAME must not both be blank
- Values are case sensitive

5.2 ORG_NAME Text (string), 50 characters

The name of the organisation submitting the weed data information Check previously submitted entries to maintain consistency of name of the organisation.

- Field RECORDER and ORG_NAME must not both be blank
- Values are case sensitive

6.1 SIZE_DIA_M Text (string), 40 characters

Approximate diameter of the weed infestation area (using metres)

SET VALUES (metres):

5
20
50
100
200 - Aerial logger (time interval) surveys only

7.1 DENS_CAT Number (Integer), Short

Weed density is the estimated area occupied by the weed expressed as a percentage of the designated site area size, whether assessed by:
- surface area occupied (for aquatic plants, smaller grasses and herbs)
- projected canopy cover (for larger grasses, vines, tall shrubs and trees)

This information can illustrate changes in severity of weed infestations across the landscape over time.
Ref: p 20. McNaught, I. et al (2008) A field manual for surveying and mapping nationally significant weeds; Bureau of Rural Sciences, Canberra.

Set Values: 11 Density classes or categories

Category Number and Description
1 ....... Absent
2 ....... < 1%
3 ....... 1 - 10%
4 ....... 11 - 50%
5 ....... > 50%
6 ....... Present but density unknown
7 ....... Not known
8 ....... Not assessed
9 ....... Aquatic - scattered
10 ..... Aquatic - 100% cover
11 ..... Eradicated and monitored

- On reinspection of a treated or historic site, where a treated weed is determined as successfully destroyed, the weed should be assessed as a density score 1 (Absent)
- Blank values are not acceptable

7.2 TREATMENT Text (string), 40 characters

What was the treatment applied today, if any?

Example values:
Aerial application
Aerial spray
Basal bark
Biological control
Cut stump
Foliar spray
Frilled
Ground application
Grubbed
Hand pull
Mechanical
Shaded or covered
Slashed or cut
Stem injection
No treatment

- This field should best describe the treatment applied to the weed area on the day the record is taken.
- If multiple treatments occurred at the same time, select the main type and record the other in comments.

8.1 PROJECT Text (string), 150 characters

Project description, where work is carried out for a specific project.
Example: Daly catchment strategic mimosa control

- Care must be taken with project names to ensure they are entered consistently for each record
- Blanks are acceptable

8.2 SEEDLINGS Text (string), 15 characters

Are seedlings present at the site?

SET VALUES:
Yes
No
Unknown
Not recorded

- Can indicate existing local seed bank or new incursion. Lack of seedlings could indicate seed bank depletion

8.3 JUVENILES Text (string), 15 characters

Are juveniles present at the site?

SET VALUES:
Yes
No
Unknown
Not recorded

- For some weed species, if juveniles are present, but seedlings and adults are not, this may indicate the local seed bank is depleted

8.4 ADULTS Text (string), 15 characters

Are adult plants present at the site?

Adult plants include any plants which have produced seed or has reached a size or appearance of maturity (fully grown) and therefore capable of producing seed.

SET VALUES:
Yes
No
Unknown
Not recorded

- Can indicate infestation has the potential to produce seeds, and therefore add to a local seed bank

8.5 SEED_PRES Text (string), 15 characters

Are seeds present (visible) at the site?

SET VALUES:
Yes
No
Not assessable
Not recorded

- Indicates new seeds are being added to the local seed bank

8.6 PAST_TREAT Text (string), 15 characters

Are there evidence of previous treatment impacts visible at the site?

SET VALUES:
Yes
No
Unknown
Not recorded

- This is the only field used to record previous treatment information

9.1 HERBICIDE Text (string), 40 characters

What was the active ingredient(s) of the herbicide applied today, if any?

Example values:
2,4-D
Fluroxypr
Glyphosate
No treatment (used if no treatment occurred at time of record)
Not applicable (used if treatment is nonchemical)

- It is encouraged to record the active herbicide ingredients rather than brand names, adjuvants or other additives

9.2 YEAR Text (string), 4 characters

The year the weed data was recorded
Format: YYYY Example: 2006

- Record as value 1900 if the year is unknown

9.3 COMMENTS Text (string), 150 characters

- This field contains information about an observation or site relevant only to the data collector or their organisation
- Comments should be restricted to information used in the short term such as aiding data entry or reminding the observer to enter a file note or follow up with a landholder

SYM_1 Text (string), 5 characters

SET VALUES:
Yes
No

- Symbology 1 field aggregates the TREATED field information.
- Can be used for treated or not treated symbology display or queries. Was previously used for NR Maps display. Layer file using this field for symbology is still available.

SYM_2 Number (Integer), Short

VALUES: 1 to 11

- Symbology 2 field represents the Density category field information.
- Can be used for symbology display or queries. Was previously used for NR Maps display. Layer file using this field for symbology is still available.

Attribute	Attribute Description	Possible Code	Code Description
1.1 INDEX	Unique record identifier, database generated. Number is generated by hosting software and may be subject to re-indexing, cannot be relied upon as a reference to a record. The INDEX field is system dependent, may also be known as FID, OBJECT ID or ID.
1.2 SITE_ID	Text (string), 15 characters Waypoint ID or other similar source identifier for this record applied by the observer. - This is not a unique identifier. - The intention of this field is to assist in tracing a record back to its field observation source. - Blank values can be entered. Null or empty string value designates no data value.
1.3 SITE_MON	Text (string), 15 characters Example DALY0001 Identifies spatially unique site with the intent of revisiting to monitor progress. - This is not a unique identifier. - Ideally, a monitoring protocol should be used in association with a site identified by this field. - Blank values can be entered. Null or empty string value designates no data value.
2.1 WEED_NAME	Text (string), 40 characters Common name of the weed species. Example: Gamba grass - Values are case sensitive.
2.2 GENUS_SPP	Text (string), 60 characters Scientific or Botanical name of the weed species i.e. Genus species. Example: Andropogon gayanus - Blank values are not acceptable - Values are case sensitive
3.1 DATE_REC	Date The date of the recorded observation. Format: DD/MM/YYYY Example: 12/03/2005 - Blank values are not acceptable
4.1 LAT_G94	Number (Double) Example: -13.02345 The latitude (Y coordinate, determines North - South), identifying the location of the weed infestation site. This must be entered in Decimal Degrees ideally to 5 decimal places (equivalent to 1 metre on the ground). The location should be recorded in the centre of the weed infestation, if possible. - Dataset is stored using the datum GDA94 (Geocentric Datum of Australia 1994) - Blank values are not acceptable
4.2 LONG_G94	Number (Double) Example: 131.45761 The longitude (X coordinate, determines East - West), identifying the location of the weed infestation site. This must be entered in Decimal Degrees ideally to 5 decimal places (equivalent to 1 metre on the ground). The location should be recorded in the centre of the weed infestation, if possible. - Dataset is stored using the datum GDA94 (Geocentric Datum of Australia 1994) - Blank values are not acceptable
4.3 REC_METHOD	Text (string), 25 characters Method used to define the weed infestation location. Current set values should be used wherever possible, historical set values have been retained for compatibility with existing record. Example values: Aerial spray Aerial survey Corridor survey Roadside survey Handheld GPS Averaged GPS Differential GPS Avenza Maps Fulcrum Itracker device Konect App WeedMate - Blank values are not acceptable
5.1 RECORDER	Text (string), 40 characters The name of the person responsible for capturing the weed data information. In the case of supervised teams the supervisor's name or generic group name (e.g. xx Rangers) should be entered against the data. Check previous submitted entries to maintain consistency of name. - Field RECORDER and ORG_NAME must not both be blank - Values are case sensitive
5.2 ORG_NAME	Text (string), 50 characters The name of the organisation submitting the weed data information Check previously submitted entries to maintain consistency of name of the organisation. - Field RECORDER and ORG_NAME must not both be blank - Values are case sensitive
6.1 SIZE_DIA_M	Text (string), 40 characters Approximate diameter of the weed infestation area (using metres) SET VALUES (metres): 5 20 50 100 200 - Aerial logger (time interval) surveys only
7.1 DENS_CAT	Number (Integer), Short Weed density is the estimated area occupied by the weed expressed as a percentage of the designated site area size, whether assessed by: - surface area occupied (for aquatic plants, smaller grasses and herbs) - projected canopy cover (for larger grasses, vines, tall shrubs and trees) This information can illustrate changes in severity of weed infestations across the landscape over time. Ref: p 20. McNaught, I. et al (2008) A field manual for surveying and mapping nationally significant weeds; Bureau of Rural Sciences, Canberra. Set Values: 11 Density classes or categories Category Number and Description 1 ....... Absent 2 ....... < 1% 3 ....... 1 - 10% 4 ....... 11 - 50% 5 ....... > 50% 6 ....... Present but density unknown 7 ....... Not known 8 ....... Not assessed 9 ....... Aquatic - scattered 10 ..... Aquatic - 100% cover 11 ..... Eradicated and monitored - On reinspection of a treated or historic site, where a treated weed is determined as successfully destroyed, the weed should be assessed as a density score 1 (Absent) - Blank values are not acceptable
7.2 TREATMENT	Text (string), 40 characters What was the treatment applied today, if any? Example values: Aerial application Aerial spray Basal bark Biological control Cut stump Foliar spray Frilled Ground application Grubbed Hand pull Mechanical Shaded or covered Slashed or cut Stem injection No treatment - This field should best describe the treatment applied to the weed area on the day the record is taken. - If multiple treatments occurred at the same time, select the main type and record the other in comments.
8.1 PROJECT	Text (string), 150 characters Project description, where work is carried out for a specific project. Example: Daly catchment strategic mimosa control - Care must be taken with project names to ensure they are entered consistently for each record - Blanks are acceptable
8.2 SEEDLINGS	Text (string), 15 characters Are seedlings present at the site? SET VALUES: Yes No Unknown Not recorded - Can indicate existing local seed bank or new incursion. Lack of seedlings could indicate seed bank depletion
8.3 JUVENILES	Text (string), 15 characters Are juveniles present at the site? SET VALUES: Yes No Unknown Not recorded - For some weed species, if juveniles are present, but seedlings and adults are not, this may indicate the local seed bank is depleted
8.4 ADULTS	Text (string), 15 characters Are adult plants present at the site? Adult plants include any plants which have produced seed or has reached a size or appearance of maturity (fully grown) and therefore capable of producing seed. SET VALUES: Yes No Unknown Not recorded - Can indicate infestation has the potential to produce seeds, and therefore add to a local seed bank
8.5 SEED_PRES	Text (string), 15 characters Are seeds present (visible) at the site? SET VALUES: Yes No Not assessable Not recorded - Indicates new seeds are being added to the local seed bank
8.6 PAST_TREAT	Text (string), 15 characters Are there evidence of previous treatment impacts visible at the site? SET VALUES: Yes No Unknown Not recorded - This is the only field used to record previous treatment information
9.1 HERBICIDE	Text (string), 40 characters What was the active ingredient(s) of the herbicide applied today, if any? Example values: 2,4-D Fluroxypr Glyphosate No treatment (used if no treatment occurred at time of record) Not applicable (used if treatment is nonchemical) - It is encouraged to record the active herbicide ingredients rather than brand names, adjuvants or other additives
9.2 YEAR	Text (string), 4 characters The year the weed data was recorded Format: YYYY Example: 2006 - Record as value 1900 if the year is unknown
9.3 COMMENTS	Text (string), 150 characters - This field contains information about an observation or site relevant only to the data collector or their organisation - Comments should be restricted to information used in the short term such as aiding data entry or reminding the observer to enter a file note or follow up with a landholder
SYM_1	Text (string), 5 characters SET VALUES: Yes No - Symbology 1 field aggregates the TREATED field information. - Can be used for treated or not treated symbology display or queries. Was previously used for NR Maps display. Layer file using this field for symbology is still available.
SYM_2	Number (Integer), Short VALUES: 1 to 11 - Symbology 2 field represents the Density category field information. - Can be used for symbology display or queries. Was previously used for NR Maps display. Layer file using this field for symbology is still available.

Supplementary Information

Further information about the application and limitations of weed data records is available by contacting the Weed Management Branch weedinfo@nt.gov.au
nt.gov.au/environment/weeds

This record maintained using the NTLIS Metadata Tool

Metadata : Northern Territory weeds dataset