| snippet:
|
The topographic wetness index shows areas with increased accumulated runoff potential, and areas with low slope and large upslope contributing areas. |
| summary:
|
The topographic wetness index shows areas with increased accumulated runoff potential, and areas with low slope and large upslope contributing areas. |
| accessInformation:
|
Illinois State Water Survey |
| thumbnail:
|
|
| maxScale:
|
5000 |
| typeKeywords:
|
[] |
| description:
|
<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>The TWI is a physically based index or indicator of the effect of local topography on runoff flow direction and accumulation. The index is a function of both the slope and the upstream contributing area</SPAN></SPAN><SPAN><SPAN>.</SPAN></SPAN><SPAN><SPAN>The computation of TWI is performed using both geographic information systems (GIS) and Python, a programing software used to enhance computing capabilities. The indices help identify rainfall runoff patterns, areas of potential increased soil moisture, and ponding areas. Illinois State Water Survey generated the index to the Illinois counties of DuPage and Will (see report at </SPAN></SPAN><A href="http://hdl.handle.net/2142/98495"><SPAN><SPAN>http://hdl.handle.net/2142/98495</SPAN></SPAN></A><SPAN>), but has subsequently generated the index for all Illinois counties. </SPAN><SPAN>The DEM used for this county was derived from LiDAR acquired in 2017. </SPAN><SPAN>While TWI is usually viewed in raster format, ISWS is distributing a version in polygon format for easier access and use.</SPAN></P></DIV></DIV></DIV> |
| licenseInfo:
|
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Illinois State Water Survey and/or The University of Illinois gives no warranty, express or implied, as to the accuracy, reliability, utility or completeness of this information. The user assumes all responsibility and risk</SPAN><SPAN>.</SPAN></P></DIV></DIV></DIV> |
| catalogPath:
|
|
| title:
|
GISDATA.DBO.TWI |
| type:
|
|
| url:
|
|
| tags:
|
["McHenry County Illinois TWI"] |
| culture:
|
en-US |
| portalUrl:
|
|
| name:
|
|
| guid:
|
|
| minScale:
|
500000 |
| spatialReference:
|
|