IndianaMap Update – September 2015

igsReported By:  Chris Dintaman
GIS Specialist
Indiana University | 611 N. Walnut Grove Avenue | Bloomington, IN 47405-2208

We have just updated three NHD layers and added two new layers to IndianaMap. If you are a frequent user of these data, please use the links below to access the Layer Gallery to download data and metadata for each of the layers.

Layer Updates

We have updated 3 layers to the Hydrology folder showing “Water Bodies Lakes LocalRes,” “Water Bodies Rivers LocalRes,” and “Water Bodies Streams LocalRes.” These three layers represent the latest release by the Indiana Department of Natural Resources (IDNR) of the Local-Resolution National Hydrography Dataset (NHD), and are current as of August 6, 2015.**

Indiana’s NHD was originally mapped at 1:100,000-scale.  Then high-resolution NHD was mapped for Indiana at 1:24,000 to add detail to the original 1:100,000-scale NHD. Now Indiana is mapping Local-Resolution NHD at 1:2,400 scale, adding even more detail and accuracy to Indiana’s NHD. Click here to launch the map and examine these updated NHD layers.

Another cool way to view the differences between the High and Local resolution NHD is to use our NHD Swipe Map to see the difference between these two data sets.  Here is a link to open the Swipe Map App – http://arcg.is/1HHmzQa

**NOTE: The Local-Resolution NHD datasets are still under development, and currently include data for twenty-nine (29) of the thirty-eight (38) HUC-08 sub-basins covering parts of Indiana.

New Layers

We have just added two new layers named “Aquifer Recharge (Near surface)” and “Aquifer Sensitivity (Near surface)” to the Hydrology folder. These raster data show estimated groundwater recharge rates (inches per year) and ranked categories of aquifer sensitivity in shallow aquifers in Indiana. These raster layers (100-m TIFFs) were created to support decision making in Indiana where knowledge of groundwater recharge rates and sensitivity to aquifer contamination is desired. Click here to launch the map and examine the new data.

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