F8606A2E4DC98FA8E040CD9B21440F2CEnglishData Requests OfficerDepartment of Lands, Planning and EnvironmentGeospatial Services Unit (on behalf of department)Datarequests.DLPE@nt.gov.au2014-05-02AS/NZS ISO 19115 Geographic Information - Metadata, ANZLIC Metadata Profile1.0 Provisional Vegetation Types over Litchfield National Park2014-05-01This spatial dataset describes vegetation types over Litchfield National Park (plus a 2km buffer). The survey area of 1,905km2 is located west of the towns Batchelor and Adelaide River and is approximately 70km south of Darwin. This project was completed in response to a need for vegetation mapping over the whole of Litchfield National Park, specifically for integrated strategic planning and particularly in regards to fire management. The project was completed using existing data and has not been verified in the field. This dataset is provided as the result of a rapid, best-effort mapping approach. Users are strongly advised to note the accuracy limitations of the dataset, particularly the attribute accuracy. The final dataset has not been validated. Download the spatial data package (contains spatial data, maps and reports) via https://data.nt.gov.au/ You are licensed to use the DENR geospatial products on the terms and conditions set out in: Creative Commons Attribution 4.0 International Public License (CC BY 4.0) at: https://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 Environment and Natural Resources. Copyright Northern Territory Government.English-13.5597-12.998130.6369131.11662014-02-282014-04-07datasetnot knownComplete0not knownGIS editing tools were used to rectify all overshoots and undershoots in line work. Polygon topology rules applied are; must not overlap, must not have gaps and each polygon has only one label.0not knownThis spatial dataset should not be used at scales greater than 1 : 100,000. The final dataset has not been validated. Sample points were used for the nearest-neighbour classification and were derived from the field sites and additional points. Initially field sites were classified according to site descriptions and plant species cover data. The spatial positioning of most sites was only approximate due to the lack of location-recording tools available at the time of data collection. Thus the positioning of each point was manually checked and adjusted where necessary, according to visual interpretation of the Landsat imagery and other modelled spatial datasets. Additional sample points were created using a visual interpretation of the Landsat imagery and other modelled datasets.0not knownClasses of vegetation type (Attribute VEG_TYPE) were defined according to the planning needs of the Parks and Wildlife Commission, field data, and visible features in the Landsat data. The assignation of classes of vegetation type had varying degrees of accuracy due to the availability of field data and the ability to visually identify each class in the datasets. In particular, there were few field data points representing the classes of Wet heath and Dry heath, both of which could not easily be identified in the Landsat imagery. This is reflected in the value of Low for the attribute Accuracy in areas classified as those two vegetation types. Wet heath and Dry heath occupy biophysically similar parts of the landscape and have similar vegetation cover to the vegetation type Sandstone woodland, so areas classified as these three vegetation types may have been confused with one another. The classes of Alluvial grassland, Melaleuca woodland and Drainage woodland had few sample points, though were more easily visually identified in the imagery, reflected in the value of Medium Accuracy for most areas mapped as those classes. For these three classes, and Riparian, segments were assigned High Accuracy if they spatially coincided with relevant map units in the Melaleuca, Riparian or Wetland datasets. The remainder of the dataset was assigned Medium Accuracy.0These boundaries and attributes of vegetation types were derived from two datasets of Landsat 8 imagery taken in 2013 (19th April and 9th August) and other data. Supplementary datasets included the 1-second DEM (http://www.ga.gov.au/meta/ANZCW0703014016.html) and a Landsat-derived model of the persistent green vegetation fraction (http://www.auscover.org.au/xwiki/bin/view/Product+pages/Persistent+Green-Vegetation+Fraction). Further datasets used were Land Units (Litchfield National Park [Survey Code: TTRAN] and Warrai Catchment [Survey Code: WARRA], both at 1:50,000), Geology (1:250,000), Wetlands (1:100,000), Melaleuca (1:100,000) and Rainforests (1:80,000). Field site data used were extracted from the Northern Territory Vegetation Site Database - Survey Codes: TTRAN, WARRA, LITCH, COLGA and LFP. Most of the sites had been surveyed between 1981 and 1992, and a few between 1995 and 2006. A classification of the LFP sites was provided by the Parks and Wildlife Commission. Classification of the Landsat data was performed using a step-wise process including a nearest-neighbour classification guided by sample points, as described in the metadata field Supplementary Information.