TransDEM Forum https://forum.transdem.de/ |
|
Geo Data - Australia https://forum.transdem.de/viewtopic.php?f=8&t=218 |
Page 1 of 3 |
Author: | geophil [ 03 Jan 2013 12:08 ] |
Post subject: | Geo Data - Australia |
NEDF Portal: SRTM-derived 1 arc sec DEM Geoscience Australia operates the National Elevation Data Framework Portal (NEDF): http://nedf.ga.gov.au/geoportal/catalog ... earch.page The 1 arc sec SRTM-based products come in three variants: Regular, smoothed ("S") and hydrologically smoothed ("H"). I recommend type "Smoothed" ("s"). See here for a visual comparison: http://forum.transdem.de/viewtopic.php?f=2&t=213. Data is free to download for packages up to 400MB (zipped). How to obtain the NEDF DEMs:
|
Author: | jackdrake [ 04 Jan 2013 12:10 ] |
Post subject: | Re: Geo Data - Australia |
Many thanks for that, I have registered a while ago but was not sure what to select. Do not need for Trainz purpose but for a local Historical Group use. |
Author: | Jerker [ 29 Jan 2013 07:53 ] |
Post subject: | Re: Geo Data - Australia |
G'day geophil, How did you get this to work, Roland? Twice now, I have downloaded two files (separate 'selections' from the same location) and on both occasions, despite following your instructions to the letter, I have been unable to extract the downloaded file. Every attempt to extract the files results in Winzip having fits or producing files that are unusable... Jerker {:)} |
Author: | geophil [ 29 Jan 2013 09:14 ] |
Post subject: | Re: Geo Data - Australia |
Garry, your download seems complete and intact and size is right? Your zip tool accepts the password provided? But extraction fails and the folder structure with "1sSRTM_2008_DEMs_ESRI_GRID_1sx1s", "dems1sv1_0" and .adf files does not materialize? Most often the cause is a corrupt zip file despite it appearing correct. |
Author: | Jerker [ 29 Jan 2013 17:05 ] |
Post subject: | Re: Geo Data - Australia |
G'day geophil, Roland, the downloads seemed to go 'as intended' and a suitably sized file was the end result (the last attempt being of some 35 Mbytes). The problems appeared to depend upon and were different for, whichever method I used to extract them from Winzip. The ability to 'open' the zipped file in Windows achieved the 'desired' result - I was able to browse through the various folders and files and they all appeared to be there but attempts to extract them from the zipped file and/or copy them across from the 'open' folder failed. As a 'last ditch' attempt, I downloaded the file from NEDF and downloaded and installed the latest Winzip. I can't say which may have solved the problem (since both actions were concurrent) but I now have things working the way they should - except for one small detail... ...I'm sure I selected the correct area to download but when I tried to 'merge' the existing Raster Maps for the route with the new DEM, I was offered the opportunity to transform them because TransDEM detected that they were not in the same Zone (zone 55 for the DEM and zone 56 for the Maps). I thought this was 'odd' but I let TransDEM do it's thing and finished up with the DEM being almost at the top of the TransDEM display window with the Raster Maps way down at the bottom. Clearly something was amiss (I suspect my selection of the area for the DEM) but I shall try again tomorrow to see if I did something wrong in that regard... ..once again, Roland, thank you for your assistance... Jerker{:)} |
Author: | Jerker [ 31 Jan 2013 03:27 ] |
Post subject: | Re: Geo Data - Australia |
G'day geophil, ...further to my issues above, it turns out the second of my 'selections' was for a totally different area (which explains the display produced by TransDEM), so it appears that all is well, except that now I have another problem (for which, because of it's completely different nature, I shall start a new Topic, elsewhere)... Jerker {:)} |
Author: | Jerker [ 16 Apr 2013 16:50 ] |
Post subject: | Re: Geo Data - Australia |
G'day geophil, Despite the indications above, I am still having major problems with the downloads I am receiving from the NEDF Portal. Would you be ever so kind, when you have a spare moment or two to download the file from this link... http://nedf.ga.gov.au/download/1365731931084/1365731931084.zip ...and using the password "l3hgldnx1ef", see if you can do anything with it. This (and all previous attempts, except the ones that I mentioned that worked above) have failed at the unzip stage (in exactly the same way)... Jerker {:)} |
Author: | geophil [ 16 Apr 2013 18:12 ] |
Post subject: | Re: Geo Data - Australia |
Looks all right to me: |
Author: | Jerker [ 17 Apr 2013 02:56 ] |
Post subject: | Re: Geo Data - Australia |
G'day geophil, Thank you, Roland. Indeed, I cannot argue with your result. The question that now needs to be answered is why am I not achieving this, as well? The Winzip Trial version that I downloaded and installed above has long since 'overstayed it's welcome' so I am only able to use Winrar or the built in Windows unzipper, neither of which appear to be able to unzip the file. Winrar reports errors as it attempts to extract each file using the 'normal' process... ...and as I mentioned earlier, although the Windows unzipper appears to do its thing (complete with a request for the password), the subsequently unzipped files send TransDEM off into 'crash heaven'... ...I simply do not understand where I am (or what is) going wrong, here... Jerker {:)} |
Author: | geophil [ 17 Apr 2013 08:50 ] |
Post subject: | Re: Geo Data - Australia |
That looks like an incomplete or corrupt zip file to me. Do you have the full 80.8 MB? The NEDF server can be slow at times. My download took more than 20 minutes last night. I am using 7-Zip on my computers. It's free, powerful and reliable. It reports alls sorts of errors for corrupt packages. This is what you should get in Windows Explorer after unpacking ("Details" view): |
Page 1 of 3 | All times are UTC + 1 hour |
Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |