TransDEM Forum

TransDEM News, Support, Hints and Resources
It is currently 28 Mar 2024 16:11

All times are UTC + 1 hour




Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: 08 Oct 2018 21:46 
Offline

Joined: 12 Apr 2011 03:30
Posts: 21
I have recently tried to download 7.5-minute 1:24,000 quadrangles from the US National Map and noticed the only option offered on the original TNM download browser page is GeoTIFF. Simply clicking on the "download" will get you a GeoTIFF. Alarming, because my version 2.6.0.1 does not read that format and, of course, neither does Acrobat.

However, I clicked on the "Metadata" option and that opened a new browser page listing all the metadata for my topographic map. Halfway down the page is the "Downloads" section. It offers two choices: GeoPDF and GeoTIFF with appropriate links. I am happy to report clicking on the GeoPDF option gave me a 7.5-minute quadrangle that TransDEM 2.6.0.1 was able to georeference the way I have been accustomed.

The National Map Download page offered GeoPDF files when I attempted downloads in May 2018, so there was no problem at that time. Has anyone else had this experience? The work-around was fairly simple to use and I hope my sharing it will be helpful.


Top
 Profile  
 
PostPosted: 09 Oct 2018 12:50 
Offline

Joined: 05 Jan 2011 16:45
Posts: 1463
I can confirm this observation. Looks like a bug in the TNM viewer query processing to me. Have you contacted them?


Top
 Profile  
 
PostPosted: 09 Oct 2018 16:36 
Offline

Joined: 12 Apr 2011 03:30
Posts: 21
I have not contacted USGS yet, but I will let them know. I will share what I learn with this community.


Top
 Profile  
 
PostPosted: 10 Oct 2018 01:28 
Offline

Joined: 12 Apr 2011 03:30
Posts: 21
Here is a note I received this afternoon that supports geophil's guess:

"Hello,
There is a temporary issue with the database that is not providing links to the GeoPDF files. It has been reported but in the meantime, you can access the GeoPDF download by clicking the Info/Metadata link in the Results list. On the page that comes up, you will find links for the GeoPDF and GeoTIFF. Another option for the Historical Topographic Maps is our TopoView site which is specifically for the historical maps with 4 formats available (JPG,GeoTIFF,GeoPDF & KML) "

This makes sense. I will keep checking on this.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC + 1 hour


Who is online

Users browsing this forum: Ahrefs [Bot] and 8 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
cron

Imprint & Privacy

Powered by phpBB® Forum Software © phpBB Group