US: A new set of topographical maps and data is now available for all 99 Iowa counties in the US. According to Department of Natural Resources spokesman, Chris Ensminger, GPS and LiDAR technology was used for data collection. Ensminger said that GPS provided them a very accurate elevation map they can use for projects such as mapping wetlands.
Ensminger added another thing they are doing is creating a floodplain map. The mapping is a joint project of Department of Natural Resources (DNR), Department of Transportation (DOT), state agricultural department and USDA Natural Resources Conservation Service.
The information is available at the DNR’s GIS library (www.igsb.uiowa.edu/nrgislibx) which has two-foot contours, shaded relief maps and digital elevation models. The project costs USD 4.3 million. DNR believes it was well worth the cost and they can earn around USD 400,000 yearly by cutting elevation work and making faster decision on projects.
The original LiDAR data points for computer-aided design are available via the University of Northern Iowa’s library at: www.geotree.uni.edu. LiDAR is available only to those with GIS software. The DNR plans to have the data and updated aerial photography available on its interactive mapping website later this spring.
Source: Radio Iowa