The need to combine tiles into a single dataset for analysis purposes is a common one – assuming there aren't underlying issues with the data, there are tools to
simplify working with tiled data sources. If ArcGIS is being used,
Mosaic datasets provide a mechanism for accessing a collection of tiles as a single file for analysis purposes. If using open source tools, you can also use GDAL's
gdal_merge utility to produce a single seamless output.
Cheers,
Shaun
From: Northeast Arc Users Group [mailto:[log in to unmask]]
On Behalf Of Jarlath P.M. O'Neil-Dunne
Sent: Monday, August 22, 2016 3:48 PM
To: [log in to unmask]
Subject: Re: Efficient way to download and use large quantities of MassGIS LiDAR data
Are you sure he is not altering the coordinate system? I have not experienced this misalignment issue.
--
Jarlath O’Neil-Dunne
University of Vermont | Spatial Analysis Lab
Twitter: @jarlathond
Blog: http://letters-sal.blogspot.com/
From:
Northeast Arc Users Group <[log in to unmask]>
on behalf of Tracy Whelen <[log in to unmask]>
Reply-To: Tracy Whelen <[log in to unmask]>
Date: Monday, August 22, 2016 at 3:45 PM
To: "[log in to unmask]" <[log in to unmask]>
Subject: Efficient way to download and use large quantities of MassGIS LiDAR data
NEARC-L,
One of the people in my lab is wanting to use the newly updated MassGIS LiDAR data as a more precise DEM than the SRTM DEMs. The MassGIS DEMs are available as tiles, however the project my coworker is working on
would involve regions of a few dozen tiles or more. While the tiles can be bulk downloaded in OLIVER, he says they aren't aligned with each other when he goes to use them, and it's frustrating to individually load that many tiles.
Does anyone know of a smoother way to access a large region of the DEM data? Even better would be if there is a way to access data using a script rather than through the OLIVER GUI.
Thanks for your help,
Tracy
Tracy Whelen
GIS Specialist, University of Massachusetts Microwave Remote Sensing Laboratory
Mount Holyoke College Class of 2014
[log in to unmask]
206-390-8759
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