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 An Oblique View of Terrain Mapping
Ryan Hamilton
Ryan Hamilton
Ryan Hamilton majored in Environmental Studies at the University of Colorado and has been employed within both the LiDAR and IFSAR mapping worlds since 1998. His interests (that all appear to be tied to mapping) include blue water sailing, backcountry skiing and big mountain and downhill mountain … More »

Fuse Data, Keep Your Hair

 
September 10th, 2013 by Ryan Hamilton

If you have worked in GIS then you have probably fused raster elevation data. So, chances are that you have also torn your hair out if these data came from different sources and had accuracy biases or projection difference. Trying to get a seamless merging of two separate elevation sets is never as easy as it initially sounds. The problems can be as complex as the misalignment of the origin point in reprojection or a reference to pixel center vs. pixel corner. Or, they can be as simple as a vertical offset or a planar tilt.

Intermap® has worked very hard to simplify the data fusion process. Over the course of a couple years we have been developing a data fusion tool and a universal projector tool. With these tools now complete, we are able to reproject to hundreds of vertical and horizontal datums with validated precision. And, with our automated fusion tool the user loads the data and species the reference data then the tool does the rest. Overlapping areas area removed, vertical bias applied, data is tilted to minimize all edges around the fusion boundary and the remaining seams are blended to complete the process.

This tool was a key component in our building of the NEXTMap® World 30™ dataset. We had thousands of data voids in the SRTM that needed to be in-filled and edge matched with ASTER and using this tool the entire process was automated with great success.  Unfortunately, I have already pulled out most of my hair, but luckily all the new entries into the GIS world may be able to sport Fabio locks thanks to our data fusion tool.

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Category: Oblique view of terrain data

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