Daniel Quinn, U.S. Fish and Wildlife Service, Alaska Region, Inventory and Monitoring, GIS Analyst 20230830 First vector digital data We digitized ATV tracks during the summer of 2023 with the use aerial imagery that was captured in May of 2022. The tracks represented in the layer are those visible in the 2022 aerial imagery. GIS analysts manually digitized the ATV tracks in this layer using aerial imagery collected in May 2022 and processed by Mark Laker during that summer. This aerial imagery has a ground-resolution of 10cm to 20cm. GIS Analysts Tristan Amaral created this layer and GIS Analyst Dan Quinn (daniel_quinn@FWS.gov) completed the project. The layer exists as a Hosted Feature Layer on ArcGIS Online. This polyline layer contains all ATV tracks that are visible in the 2022 aerial imagery. The area of interest is primarily to the north and west of Cold Bay, on and around Izembek Wildlife Refuge. This data set was developed for the Alaska Region (Region 7) of the U.S. Fish and Wildlife Service. More specifically upon request from Izembek National Wildlife Refuge Staff. 20220501 20230830 This layer’s extent is of the Izembek National Wildlife Refuge and the land that immediately surrounded on the Alaskan Peninsula. Complete None planned -162.7390 -162.3473 55.3590 55.2217 ISO 19115 Topic Categories environment None Izembek Izembek National Wildlife Refuge ATV Tracks May 2022 Alaskan Peninsula None The United States Fish and Wildlife Service (Service) shall not be held liable for improper or incorrect use of the data described and/or contained herein. While the Service makes every reasonable effort to ensure the accuracy and completeness of data provided for distribution, it may not have the necessary accuracy or completeness required for every possible intended use. The Service recommends that data users consult the associated metadata record to understand the quality and possible limitations of the data. The Service creates metadata records in accordance with the standards endorsed by the Federal Geographic Data Committee.As a result of the above considerations, the Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of the data. It is the responsibility of the data user to use the data in a manner consistent with the limitations of geospatial data in general and these data in particular. Although these data have been processed successfully on a computer system at the Service, no warranty, expressed or implied, is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This applies to the use of the data both alone and in aggregate with other data and information U.S. Fish and Wildlife Service, Alaska Region, Inventory and Monitoring Daniel Quinn GIS Analyst mailing and physical

1011 E Tudor Rd STE 200

Anchorage Alaska 99503 US 9077863309 daniel_quinn@fws.gov Tristan Amaral, Mark Laker, Alison R Williams, and Daniel Quinn Esri ArcGIS 13.1.0.41833 Manual Digitizing Methodology: To manually digitize all ATV tracks in the Izembek Imagery a hosted feature layer was created on ArcGIS Online. Each track that was identified in the imagery was traced or digitized and added as a feature to the hosted feature layer on ArcGIS Online . The individual segments were assigned as Primary Track, Secondary Track, or Tertiary Track based off their appearance. Please see the “Attribute Table Data Fields Definitions” section of this document track type definition. Moving systematically through the aerial images was done column buy column, from the west to the east, each column of images was inspected from the north to south. Individual images or rasters were used, as opposed to combining all the images in a mosaic raster dataset. The color rendering often made the tracks clearer in the individual images. If a track was not present nothing was mapped, no assumptions were made about where ATV's likely traveled. As a result, many digitized track segments are left as standalone features or as dead ends where the ATVs failed to leave a visible imprint in the substrate. Analysts inspected aerial images at a scale of 1:2,000 to 1:1,500. None The ATV tracks in this layer were created by manually digitizing what could be seen from aerial imagery that was collected during May 2022 and processed by Mark Laker during that summer. The aerial imagery used had a ground-resolution of 10cm to 20cm. The creation of this layer was begun by GIS Analysts Tristan Amaral and continued by GIS Analysts Dan Quinn (daniel_quinn@FWS.gov). The layer exists as a Hosted Feature Layer on ArcGIS Online. To manually digitize all ATV tracks in the Izembek Imagery a hosted feature layer was created on ArcGIS Online. Each track that was identified in the imagery was traced or digitized and added as a feature to the hosted feature layer on ArcGIS Online . The individual segments were assigned as Primary Track, Secondary Track, or Tertiary Track based off their appearance. Please see the “Attribute Table Data Fields Definitions” section of this document track type definition. Moving systematically through the aerial images was done column buy column, from the west to the east, each column of images was inspected from the north to south. Individual images or rasters were used, as opposed to combining all the images in a mosaic raster dataset. The color rendering often made the tracks clearer in the individual images. Public Availability of Aerial Imagery: The aerial imagery used to create this data is publicly available, and may be downloaded through the USGS EarthExplorer (https://earthexplorer.usgs.gov/). To acquire the aerial imagery please follow the below steps: 1. Go to the USGS EarthExplorer at https://earthexplorer.usgs.gov/. 2. Establish your AOI (area of interest) that includes the Izembek Nantioal Wildlife Refuge on the “Search Criteria” tab. Then click on the “Data Sets” tab and expand "Aerial Imagery" and then check "High Resolution Orthoimagery.” 3. Click on the “Results” tab. 20230801 Vector String 0 Izembek_WR_ATV_Tracks_Metadata Attributes Esri and USFWS OBJECTID Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. Esri Coordinates defining the features. Author This field holds the name of the individual who created or digitized the track feature. USFWS Track_Segm Feature geometry. Esri Shape_Leng Feature geometry. Esri GlobalID ID Esri ATV_Track_Types All track features have been assigned to one of three categories. The three categories are defined as Primary Track, Secondary Track, or Tertiary Track. o Primary Track Nearly complete or total loss of vegetation cover and organic litter within the track, bare soil widespread Heavily traveled with two tire tracks becoming a single wide track Trail braiding of numerous tracks in some areas Likely used by many vehicles o Secondary Track Track obvious; vegetation cover lost and/or organic litter pulverized in primary use areas. Likely used by multiple vehicles o Tertiary Track Track distinguishable; slight loss of vegetation cover Used as a spur trail or track Likely used by a single vehicle USFWS All track features have been assigned to one of three categories. The three categories are defined as Primary Track, Secondary Track, or Tertiary Track. Track_Segment_Length_Miles The length of the track segment in miles. USFWS 0.000878 1 Track_Segment_Length_Kilomete The length of the track segment in Kilometers. USFWS 0.001412 2.594279 Shape_Length Length of feature in internal units. Esri Positive real numbers that are automatically generated. 20230816 U.S. Fish and Wildlife Service, Alaska Region, Inventory and Monitoring Daniel Quinn GIS Analyst mailing and physical

1011 E Tudor Rd STE 200

Anchorage Alaska 99503 US 9077863309 daniel_quinn@fws.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time