20200909
18083700
1.0
FALSE
PLC_Impervious_2017
002
-8437211.949751
-8352685.949751
4643238.866407
4842990.866407
1
Projected
GCS_WGS_1984
Linear Unit: Meter (1.000000)
WGS_1984_Web_Mercator_Auxiliary_Sphere
<ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/2.8.0'><WKT>PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator_Auxiliary_Sphere"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],PARAMETER["Auxiliary_Sphere_Type",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",3857]]</WKT><XOrigin>-20037700</XOrigin><YOrigin>-30241100</YOrigin><XYScale>148923141.92838538</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>102100</WKID><LatestWKID>3857</LatestWKID></ProjectedCoordinateSystem>
150000000
5000
FGDC
20210827
16090500
20210907
13481800
Impervious Surface data layer for 2017 surface conditions. To identify impervious surfaces for the purpose of modeling such as stormwater, and atmospheric pollutant modeling. The dataset is suitable for many planning and modeling purposes.
<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN>The impervious surface data created by AIS for the 2017 Update was produced to the same level as the State’s previous datasets, per the project requirements. The 2017 Impervious Surface data layer was created using a combination of ArcGIS’ Image Classification and raster data editing toolsets. The State provided AIS with their 2017 state-wide, 4-band image (in SID format) which was clipped using the boundary of each production modules (45 in all). Each production module image was resampled to a resolution of one meter; then Arcmap’s Segment Mean Shift function was using to produce a segmented image. A training set was created for each production module segmented image and Arcmap’s Maximum Likelihood Classification tool was used to produce a classified image with three pixel values ( 1 = Impervious Surface, 2 = Pervious, and 3 = Shadow). Each classified image was further processed to add water pixels, derived from NHD waterbody polygons, and road pixels, based off of the State’s centerline data. Using Arcmap’s Reclass tool, each image had the Pervious class and Water class combined and the Impervious class and Road class combined. The shadow class processed by converting all shadow pixels to noData, then using the image processing tool Nibble, the noData values were converted to either Pervious or Impervious values. The classified images, now with two pixel values (value 3 was removed), were now ready for visual review and editing.</SPAN></P></DIV></DIV></DIV>
Mapped by Aerial Information Systems, Inc. of Redlands, California for the Delaware Department of Transportation
2017 Impervious Surface Data
2020-07-01T00:00:00
2021-08-27T00:00:00
raster digital data
external
8e4a45af632b3e3742aa56256e9eeef90f25884e
FirstMap
Delaware Department of Technology and Information (DTI)
801 Silver Lake Blvd
Dover
DE
19904
US
FirstMap@delaware.gov
302-739-9560
FirstMap
True
FirstMap
Bruce Allen
Delaware Department of Transportation
Planning Supervisor
800 Bay Road
Dover
DE
19901
Bruce.Allen@delaware.gov
US
302-760-2135
United States of America (USA)
Mid Atlantic
Delaware (DE)
Kent County
New Castle County
Sussex County
Imagery
BaseMaps
EarthCover
Impervious Surface
LandUseLandCover
Structure
1
-75.792764
-75.033455
39.841877
38.450328
Imagery collection timeframe
2017-03-01T00:00:00
2017-05-08T00:00:00
Esri ArcGIS 12.8.0.29751
ISO 19115 Topic Categories
Imagery, BaseMaps, Earth Cover, Impervious Surface, LandUseLandCover, Structure
Delaware Place Thesaurus
United States of America (USA), Mid Atlantic, Delaware (DE), Kent County, New Castle County, Sussex County
external
8e4a45af632b3e3742aa56256e9eeef90f25884e
FirstMap
Delaware Department of Technology and Information (DTI)
801 Silver Lake Blvd
Dover
DE
19904
US
FirstMap@delaware.gov
302-739-9560
FirstMap
True
FirstMap
external
adf83241d11156544f77c4a9c0c05185b665de64
Bruce Allen
Delaware Department of Transportation
Planning Supervisor
800 Bay Road
Dover
DE
19901
Bruce.Allen@delaware.gov
US
302-760-2135
True
Bruce Allen
external
8e4a45af632b3e3742aa56256e9eeef90f25884e
FirstMap
Delaware Department of Technology and Information (DTI)
801 Silver Lake Blvd
Dover
DE
19904
US
FirstMap@delaware.gov
302-739-9560
FirstMap
True
FirstMap
external
adf83241d11156544f77c4a9c0c05185b665de64
Bruce Allen
Delaware Department of Transportation
Planning Supervisor
800 Bay Road
Dover
DE
19901
Bruce.Allen@delaware.gov
US
302-760-2135
True
Bruce Allen
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The State of Delaware makes no warranty or representation, expressed or implied, with respect to the quality, content, accuracy, completeness, currency, or non-infringement of proprietary rights, of any of the GIS or other data or information, or any other materials and items, that are displayed or made available for download from this site. All such data, information, items and materials (collectively, the “FirstMap Data”) are provided "as is" and users are fully and solely responsible for any consequences of use. FirstMap Data may have been created from a variety of sources, including sources beyond the control of the State of Delaware, and are subject to change without notice. To the extent you use, apply, add to, modify or implement this information in your own information system or other setting, or otherwise for your own purposes, you do so at your own risk. In no event shall the State of Delaware or its agencies, officers, employees, agents, or representatives be liable for any damages of any kind or nature whatsoever including, but not limited to, direct, indirect, special, punitive, incidental, exemplary or consequential damages arising from your downloading, modifying, sharing, distributing, or using of FirstMap Data even if notified of the possibility of such damages. Further, the State of Delaware does not accept liability for any damages or misrepresentation caused by inaccuracies in the FirstMap Data or as a result of changes to the FirstMap Data, nor is there responsibility assumed to maintain the FirstMap Data in any manner or form.</SPAN></P></DIV></DIV></DIV>
20210907
File Geodatabase Raster Dataset
dataset
EPSG
6.18.3(9.3.1.2)
Pixel
199752
84526
1.000000
1.000000
8
1
Upper Left
FALSE
LZ77
1
pixel codes
FGDBR
TRUE
row and column
1.000000
1.000000
VAT_PLC_Impervious_2017
Table
2
Grid cell attributed with Impervious Surface code
Originator
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Value
Value
Integer
4
0
0
Pixel value. 1 = Pervious, 2 = Impervious
Originator
Static integer value
Count
Count
Double
8
0
0
Count of pixels
Originator
Calculated field
external
adf83241d11156544f77c4a9c0c05185b665de64
Bruce Allen
Delaware Department of Transportation
Planning Supervisor
800 Bay Road
Dover
DE
19901
Bruce.Allen@delaware.gov
US
302-760-2135
True
Bruce Allen
external
8e4a45af632b3e3742aa56256e9eeef90f25884e
FirstMap
Delaware Department of Technology and Information (DTI)
801 Silver Lake Blvd
Dover
DE
19904
US
FirstMap@delaware.gov
302-739-9560
FirstMap
True
FirstMap
external
8e4a45af632b3e3742aa56256e9eeef90f25884e
FirstMap
Delaware Department of Technology and Information (DTI)
801 Silver Lake Blvd
Dover
DE
19904
US
FirstMap@delaware.gov
302-739-9560
FirstMap
True
FirstMap
external
adf83241d11156544f77c4a9c0c05185b665de64
Bruce Allen
Delaware Department of Transportation
Planning Supervisor
800 Bay Road
Dover
DE
19901
Bruce.Allen@delaware.gov
US
302-760-2135
True
Bruce Allen
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