PCA_Tool/Elements_by_Quad (MapServer)

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Service Description: Abstract: The Colorado Natural Heritage Program (CNHP) collects data on rare and imperiled species, subspecies and unique natural communities in Colorado. An element occurrence (EO) represents a location in which a species, subspecies or natural community is, or was, present. An EO has potential continued (or historic) presence and/or regular recurrence at a given location and has practical conservation value. Due to the sensitive nature of these data, EOs were used to generate a list of elements by 7.5 minute USGS quadrangles. This file represents all tracked species, subspecies and natural communities currently located on a particular 7.5 minute USGS quadrangle, historically located on a particular 7.5 minute USGS quadrangle and potentially located on a particular 7.5 minute USGS quadrangle. Data are for non-commercial use only. Purpose: CNHP provides information on the distribution of Colorado's rare and imperiled species, subspecies and unique natural communities to public and private agencies and individuals for environmental review, proprietary land management, resource planning, biological and ecological research and general scientific reference. Supplemental_Information: Data were derived from field surveys performed by CNHP and other credible sources such as Forest Service personnel, Bureau of Land Management staff, etc. Data are available in geodatabase format or shapefile format; feature type is regions or multi-part shapes. Lists of elements by quadrangle were generated by intersecting EO data with a quadrangle coverage to generate a list of elements per quad. Records with general mapping precision (imprecise locational data) were converted to centroids prior to the intersection to avoid grossly inflating the number of elements potentially located on a quad. Polygon data were used during the intersection for all other records. Mapping methodology for EOs used to generate the list of elements in this file: Old Method: Data were compiled onto 7.5 minute U.S.G.S. topographic maps. Point coordinates, representing the centrum of the occurrence, were measured manually in degrees, minutes, and seconds of longitude and latitude. Coordinates were converted to decimal degrees and used to generate a GIS point coverage with single precision. During the data conversion process, all point data had to be converted to polygons. Points were buffered by mapping precision, the spatial uncertainty of the element occurrence, in order to capture the maximum extent of the occurrence (ex. EO with seconds mapping precision) OR to represent the entire area in which an EO could fall (ex. EOs with minutes or general mapping precision). Natural community polygons were created differently. Least rectangles, the bounding box of an occurrence, were generated using the northernmost, southernmost, westernmost and easternmost coordinates of the community. Any natural community without least rectangle coordinates was entered into the system as a point and buffered by mapping precision. The old method did not adequately represent the locations of large EOs or EOs with high spatial uncertainty. In response to these concerns, NatureServe, CNHP's parent organization, designed the Biodiversity Tracking and Conservation System (BIOTICS) which integrates spatial data using ArcView 3.3 (ESRI 1992-2002) with narrative and tabular data using Oracle 10x (Oracle Corporation 1998-2004). To learn more about the BIOTICS data model, refer to http://www.natureserve.org/prodServices/biotics.jsp New Method: For EOs with seconds mapping precision: 1) any EO larger than 12.5 meters (CNHP's minimum mapping unit) in length and width is digitized as a polygon, 2) any EO greater than 12.5 meters in length but less than 12.5 meters in width is digitized as a line and buffered 6.25 meters for a total width of 12.5 meters, and 3) any EO less than 12.5 meters in length and width is entered as a point and buffered by 6.25 meters (for a diameter of 12.5 meters) if the coordinates were captured via GPS and differentially corrected. Points not captured via GPS are given larger buffer distances. These distances are based on the information provided by the data source or the best estimate of CNHP's information managers. EOs with minutes or general mapping precision cannot be accurately mapped since the data source did not provide specific directions. CNHP might know an EO is within a county, PLSS Township or a State Wildlife Area. In these examples, CNHP would use GIS layers of counties, Townships and managed areas to represent the possible location of the occurrence. Hence, polygons of minutes and general EOs represent the area in which the EO could occur. CNHP is reviewing EO polygons as time and funding allows. Eventually, all EOs will meet new methodology standards. Currently, 54% of occurrences meet new methodology standards.

Map Name: Layers

Legend

All Layers and Tables

Layers:

Statewide Elements by Quad (0)

Description:

Copyright Text: Colorado Natural Heritage Program

Spatial Reference: 102100 (3857)

Single Fused Map Cache: false

Initial Extent:

Full Extent:

Units: esriMeters

Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP

Document Info:

Supports Dynamic Layers: false

MaxRecordCount: 1000

MaxImageHeight: 4096

MaxImageWidth: 4096

Supported Query Formats: JSON, AMF, geoJSON

Min Scale: 1.8489297737236E7

Max Scale: 9027.977411

Supports Datum Transformation: true

Child Resources: Info

Supported Operations: Export Map Identify QueryDomains Find Return Updates Generate KML