CDC9FABDCF7A22CDE040CD9B21443996EnglishData Requests OfficerDepartment of Lands, Planning and EnvironmentGeospatial Services Unit (on behalf of department)Datarequests.DLPE@nt.gov.au2026-04-10AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile1.0 Northern Territory weeds dataset2003-06-012018-09-17There 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.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 2026.English-26-101291382003-06-012026-04-10datasetnot knownComplete0not knownNot documented0not knownPositional 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.0not knownThe 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 1/1/1900.0NT 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.