ArcGIS REST Services Directory Login | Get Token
JSON | SOAP | WMS | WCS

Elevation/IL_DeKalb_DEM_2018 (ImageServer)

View In:   ArcGIS JavaScript   ArcGIS Online map viewer   Google Earth   ArcMap

View Footprint In:   ArcGIS Online map viewer

Service Description:

Product: These lidar data are processed Classified LAS 1.4 files, formatted to 10097 individual 2000 foot x 2000 foot tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary. Geographic Extent: Grundy, Kendall, and DeKalb County, Illinois, covering approximately 1,388 square miles. Grundy, Kendall, and DeKalb Counties are one area of interest (AOI) from a lidar survey that was collected over two (2) areas of interest in Illinois identified as LaSalle and Expansion Counties. LaSalle and Expansion Counties cover a total of approximately 2,563 square miles. Dataset Description: Grundy, Kendall, and DeKalb Counties, Illinois 2017 Lidar project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.7 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2; Quality Level 2. The data was developed based on a horizontal projection/datum of NAD83 (2011), State Plane Coordinate System Illinois East (FIPS 1201), US Survey Feet and vertical datum of NAVD88 (GEOID12B), US Survey Feet. Lidar data was delivered as flightline-extent unclassified LAS swaths, as processed Classified LAS 1.4 files, formatted to 10097 individual 2000 foot x 2000 foot tiles, as tiled Intensity Imagery, and as tiled bare earth DEMs; all tiled to the same 2000 foot x 2000 foot schema. Ground Conditions: Lidar was collected in November 2017, due to an isolated anomaly found in the the lidar data in LaSalle County one re-flight was flown in April 2018, while no snow was on the ground and rivers were at or below normal levels. A Low Confidence polygon was use to circumscribe an area where lidar was reflected by particulates in smoke stack emission. Photons were unable to penetrate through the emissions for collection of ground surface within the polygon. The emission cloud obscures approximately 3.72 acres of ground surface. Tiles in which the emission cloud occurred are 99101727 and 99301727. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, GRW Aerial Surveys, Inc. established a total of 53 ground control points of which 50 were used to calibrate the lidar to known ground locations established throughout the LaSalle and Expansion Counties project areas. An additional 157 independent accuracy checkpoints, 89 in Bare Earth and Urban landcovers (89 NVA points), 68 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (68 VVA points), were used to assess the vertical accuracy of the data of the entire project area. These checkpoints were not used to calibrate or post process the data.



Name: Elevation/IL_DeKalb_DEM_2018

Description:

Product: These lidar data are processed Classified LAS 1.4 files, formatted to 10097 individual 2000 foot x 2000 foot tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary. Geographic Extent: Grundy, Kendall, and DeKalb County, Illinois, covering approximately 1,388 square miles. Grundy, Kendall, and DeKalb Counties are one area of interest (AOI) from a lidar survey that was collected over two (2) areas of interest in Illinois identified as LaSalle and Expansion Counties. LaSalle and Expansion Counties cover a total of approximately 2,563 square miles. Dataset Description: Grundy, Kendall, and DeKalb Counties, Illinois 2017 Lidar project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.7 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2; Quality Level 2. The data was developed based on a horizontal projection/datum of NAD83 (2011), State Plane Coordinate System Illinois East (FIPS 1201), US Survey Feet and vertical datum of NAVD88 (GEOID12B), US Survey Feet. Lidar data was delivered as flightline-extent unclassified LAS swaths, as processed Classified LAS 1.4 files, formatted to 10097 individual 2000 foot x 2000 foot tiles, as tiled Intensity Imagery, and as tiled bare earth DEMs; all tiled to the same 2000 foot x 2000 foot schema. Ground Conditions: Lidar was collected in November 2017, due to an isolated anomaly found in the the lidar data in LaSalle County one re-flight was flown in April 2018, while no snow was on the ground and rivers were at or below normal levels. A Low Confidence polygon was use to circumscribe an area where lidar was reflected by particulates in smoke stack emission. Photons were unable to penetrate through the emissions for collection of ground surface within the polygon. The emission cloud obscures approximately 3.72 acres of ground surface. Tiles in which the emission cloud occurred are 99101727 and 99301727. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, GRW Aerial Surveys, Inc. established a total of 53 ground control points of which 50 were used to calibrate the lidar to known ground locations established throughout the LaSalle and Expansion Counties project areas. An additional 157 independent accuracy checkpoints, 89 in Bare Earth and Urban landcovers (89 NVA points), 68 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (68 VVA points), were used to assess the vertical accuracy of the data of the entire project area. These checkpoints were not used to calibrate or post process the data.



Single Fused Map Cache: false

Extent: Initial Extent: Full Extent: Pixel Size X: 1.9999896897449996

Pixel Size Y: 1.999990406721001

Band Count: 1

Pixel Type: F32

RasterFunction Infos: {"name":"None","description":"","help":""}

Mensuration Capabilities: Basic

Has Histograms: false

Has Colormap: false

Has Multi Dimensions : false

Rendering Rule:

Min Scale: 0

Max Scale: 0

Copyright Text: NRCS agricultural conservation, FEMA, Illinois State Geological Survey

Service Data Type: esriImageServiceDataTypeGeneric

Min Values: 445.6684265136719

Max Values: 992.3200073242188

Mean Values: 829.4525564130112

Standard Deviation Values: 66.88494098266361

Object ID Field:

Fields: None

Default Mosaic Method: Center

Allowed Mosaic Methods:

SortField:

SortValue: null

Mosaic Operator: First

Default Compression Quality: 75

Default Resampling Method: Bicubic

Max Record Count: null

Max Image Height: 4100

Max Image Width: 15000

Max Download Image Count: null

Max Mosaic Image Count: null

Allow Raster Function: true

Allow Compute TiePoints: false

Supports Statistics: false

Supports Advanced Queries: false

Use StandardizedQueries: true

Raster Type Infos: Has Raster Attribute Table: false

Edit Fields Info: null

Ownership Based AccessControl For Rasters: null

Child Resources:   Info   Key Properties   Legend   MultiDimensionalInfo   rasterFunctionInfos

Supported Operations:   Export Image   Identify   Measure   Compute Histograms   Compute Statistics Histograms   Get Samples   Compute Class Statistics