Another way to download the files is to use python’s urllib. This works out well if you have the index tile. Iterate the records in the tile you want and download each tile.
You can take it a step further and process the data into another format in that same loop.
Check out the top voted answer in this thread.
Best,
Mark Zito
From: Northeast Arc Users Group [mailto:[log in to unmask]]
On Behalf Of Chris Watson
Sent: Wednesday, August 24, 2016 8:52 AM
To: [log in to unmask]
Subject: Re: Efficient way to download and use large quantities of MassGIS LiDAR data
Tracy,
I use these tiles all the time and rarely have significant edge issues. I suspect this is a projection problem. And, try mosaicking them before viewing
as the mosaicking algorithm may accomodate minor edge issues.
As for scripting, I’ve been useing wget (https://www.gnu.org/software/wget/)
and it works great.
See the section in yellow titled: “To Download the DEMs for the above areas:”
MassGIS is now recommending WinWGet, but I haven’t used that yet so cannot comment on it. See the instructions on this page, generally same for wget or WinWGet.
---
Chris Watson
School for the Environment
University of Massachusetts Boston
100 Morrissey Boulevard
Boston, MA 02125-3393
umb.edu/academics/environment
508-676-3144 (P)
From: Northeast Arc Users Group [mailto:[log in to unmask]]
On Behalf Of Tracy Whelen
Sent: Monday, August 22, 2016 3:46 PM
To: [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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