The Shuttle Radar Topography Mission (SRTM) obtained elevation data on a near-global scale to generate the most complete high-resolution digital topographic database of Earth. SRTM consisted of a specially modified radar system that flew onboard the Space Shuttle Endeavour during an 11-day mission ...

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2
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0answers
322 views

How to best intersect vector data with raster data?

I have Open Street Map [OSM] data imported so that I can access the geometry of buildings. I have also loaded SRTM digital height data from NASA from a GeoTIFF raster. I have projected the raster into ...
2
votes
0answers
163 views

How to convert DTED Level 1 into SRTM DTED

We have a GIS tool that handles only SRTM DTED level 1 terrain files. SRTM level 1 terrain files are limited to 60 deg lat. So I need to fill up the gap from 60 lat up to 90 deg lat. I have DTED ...
1
vote
3answers
255 views

SRTM NASA hillshade grainy appearance

I'm trying to create a hillshade surface from SRTM files downloaded form Earth Explorer, but the appearance is not the expected. It has a grainy surface that I would like eliminate to have a ...
1
vote
1answer
259 views

How to compare accuracy of two DEM using GRASS

How do I compare accuracy of two DEM data (lidar and srtm) (possibly through rmse) using GRASS GIS? thanks
1
vote
2answers
481 views

Where can I programmatically download SRTM_V4.1 data?

SRTM v4 is an effort by the folks at CIAT-CSI to scrub, polish, and remove gaps in the raw SRTM data released by NASA (SRTM 3). One userfriendly interface : http://dwtkns.com/srtm/ provides ...
1
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2answers
3k views

How to use SRTM DEM files for shaded relief in ArcMap?

I would like to create a nice shaded relief for France using SRTM3 data. Most of the threads on the subject are from awhile ago, when ArcMap was not able to import these without changing the file ...
1
vote
1answer
635 views

Using SRTM data, how to get the coordinates of the peaks visible from a location?

Using SRTM data and a coordinate-altitude database of the peaks, I want to get the coordinates of the visible peaks from my location. I want to make an application similar to this. How is this ...
1
vote
1answer
123 views

Issues with getting the height from SRTM gdalwarp WGS84(EPSG:4326) to Mercator(EPSG:3857)

I am trying to use the SRTM .hgt file to obtain the height of a location. My issue is that I wish to reproject the SRTM file from WGS84 to Mercator but the height returned is not consistent after ...
1
vote
2answers
428 views

How to effectively merge SRTM 1 arc data?

We have around 1800 1 arc-second SRTM tiles (Geotiff). How to effectively merge all the tiles into one single file ? We are thinking about splitting 100 files per folder and merge them together using ...
1
vote
1answer
192 views

Need to extract coordinate information from SRTM 3 files

From this link here - http://www2.mmm.ucar.edu/wrf/users/docs/user_guide_V3/users_guide_chap3.htm#_Writing_Static_Data I wrote code in java to transform SRTM3 data into WRF geogrid data. I read the ...
1
vote
1answer
35 views

Problem with SRTM 30 m data while creating watershed

I have used SRTM 90 m in many of my hydrology projects for creating watershed and so far it has proven its worthiness. But, I haven't had any luck with its newer and high resolution SRTM 30 m ...
1
vote
2answers
877 views

How do you convert SRTM HGT elevations from WGS84 into meters above sea level?

I am building a JavaScript script that reads binary HGT files - as generated by the SRTM - and converts the data into bitmaps viewable in your browser. You can try out the script and view the source ...
1
vote
1answer
129 views

How to: script convertion from SRTM to 3D printable file?

Given a STRM3.tiff file as input. How to convert this STRM.tiff file into a 3D printable file ? which I may load into most 3D printers' sofwares. My objective is to print some terran, lunar, or ...
1
vote
1answer
269 views

How to distinguish SRTM from DTED using C#?

Does anyone know how to easily distinguish between SRTM vs DTED programmatically without opening file metadata header? both are .dt1 or .dt2 extensions.
1
vote
1answer
391 views

How can I recalculate an attribute based on overlap with another layer?

I have 2 layers: The first one is a point Layer (converted from SRTM) with height information. The second one is a polygon layer (shows the forest). I want to reduce the height value - let's say ...
1
vote
1answer
740 views

Using Latitude and Longitude with SRTM3 DEM file

I am new to working with DEM files but have a need to be able to work with SRTM3 DEM files to calculate elevation given a Lat,lon coordinates. I understand from reading the documentation that the ...
1
vote
0answers
10 views

How to get a multi-attributes vector from an SRTM raster in QGIS?

I split an SRTM raster into 3 different raster files representing the altitude, the slope and the exposure, using QGIS DEM analysis tools. How can I output a single vector file with the 3 attributes ...
1
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0answers
33 views

Generating continuous aspect surfaces from DEM with QGIS

I'm trying to extract aspect surfaces from different DEM sources at different resolutions in QGIS. I've had success working with SRTM-derived grids (3-arcseconds) and am trying to perform the same ...
1
vote
0answers
26 views

Swapping bytes for SRTM 16-bit binary format in ArcMap?

I am using ArcMap 10.2.2. I have two .hgt files in 16-bit signed integer data. All I have done so far is to mosaic them together (Mosaic to new raster). Since the DEM data are provided in Motorola ...
1
vote
1answer
67 views

Displaying contour lines calculated from SRTM in Google Earth?

I'm relatively inexperienced in GIS, but would like to display contour lines calculated from SRTM data in Google Earth. It doesn't matter whether they are actual linestrings or just an image ...
1
vote
1answer
33 views

SRTM 1arcsec transformation in ArcMap?

I downloaded SRTM data from http://earthexplorer.usgs.gov/ (tile n49 e019 - North Slovakia and Poland). I need to project data into another coordinate system and projection, but I still have an 999999 ...
1
vote
1answer
148 views

SRTM vs Google Earth Pro elevation data

I am working on elevation data for an area in Sudan. Between Google Earth Pro and SRTM elevation data, which one is more reliable?
1
vote
1answer
69 views

How to align ASTER GDEM with Google Maps?

I'm using ASTER GDEM V2 to pick heights at lon-lat coordinates obtained from Google Maps but I found that at some locations - particularly San Francisco: https://goo.gl/maps/w7p1K - the DEM seem to be ...
1
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0answers
70 views

Calculating position in SRTM grid

I'm actually trying to calculate a grid point position in a SRTM grid by row and column count. So I got a position by lat/lon, then calculating the row and column in my hgt-file (this post helped me) ...
1
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0answers
36 views

Resampling methodology when projecting a raster

When projecting an SRTM raster with "Project Raster" tool in ArcGIS10.2, what is the best resampling methodology, bilinear ot cubic convolution?
1
vote
1answer
196 views

How to obtain elevation value from given SRTM data on mouse click in web browser?

I need JavaScript code for obtaining elevation data from SRTM tiff image. I have used Google APIs, but I need for downloaded SRTM tiff image. (SRTM file is being loaded on a base layer, and both ...
1
vote
1answer
88 views

DEM error when trying to do topographic correction in GRASS

I'm new to GRASS gis and I'm trying to do a topographic correction (i.topo.corr) of 9 ASTER bands using SRTM dem. I keep getting this error message: ERROR: Illumination model is of CELL type Is ...
1
vote
1answer
258 views

Using gdalwarp with multiple elevation models

I'm trying to use gdal_warp to slice and convert some SRTM data. The data I'm interested in are in S30E152.hgt and S30E153.hgt. What I'd like to do is: Convert these DEM files from EPSG:4326 to ...
1
vote
0answers
35 views

Converting DEM data to height information in meters using QGIS? [duplicate]

I'm relatively new with QGIS and currently I'm working with ASTER and SRTM DEMs. The goal is to create vector heightcontours with labeling in meter. Can you tell me how I can convert the grayband ...
1
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0answers
161 views

Efficient computation of path profile with Numpy and GDAL

I have numpy array with SRTM elevation data and I need calculate path profiles - vectors with elevation data from one point (transmitter) to every points of my map. Here's my current solution: def ...
1
vote
0answers
234 views

What is most suitable DEM to delineate watershed (from spot height, ASTER and SRTM)?

I have three DEMs of our country which are spot height DEM, SRTM DEM and ASTER DEM. SRTM has 90m resolution and ASTER has 30m resolution. My supervisor told me to delineate watershed using these ...
0
votes
1answer
301 views

Elevation value (in meters) from SRTM [closed]

How do I determine elevetion/terrain height value from SRTM data?
0
votes
1answer
195 views

cut square from geotiff

i want to make a 3d modell out of the mount everest and some other mountains. what i need therefore is a 14km² square around the peak from the mountain. so basically i use qgis to extract the area ...
0
votes
1answer
52 views

Where can I find SRTM DSMs (digital surface model)?

I'm interested in finding a 30 meter DSM (digital surface model that includes canopy) from SRTM with the hope of creating a 30 meter canopy height model. I know that it can be done because the ...
0
votes
1answer
4k views

How can I convert SRTM data to DEM or DTED?

i am working on a project which is not commercial and i need some digital elevation data for visualization. in net i have found a link and i have downloaded .asc data from following link.. SRTM Data ...
0
votes
1answer
457 views

How to transform a DEM to a cartesian coordinate system?

I am using the script r.inund.fluv. I run the script with all the required parameters and it produced a lot or errors. I emailed the author of the script and he said that "I think you are not ...
0
votes
2answers
952 views

Why is this SRTM TIFF not visible in GRASS GIS 6.4.3?

I want to use interpolated SRTM data for Germany to generate an STL terrain map for use in a CFD application. My SRTM data comes from the OpenDEM project. SRTM data normally has voids, but this data ...
0
votes
0answers
22 views

building artificial dam in a canyon [duplicate]

I want to calculate the water volume dammed by a dam in a canyon. I managed to calculate the water volume but I actually need a dam in a certain place of the gorge so I can pursuit my calculations. I ...
0
votes
0answers
22 views

Cannot change an SRTM raster rendering with single band pseudocolour [duplicate]

I'm trying to colorize a SRTM raster in QGIS 2.10 following a tutorial found on the Ireland QGIS User Group Blog. My problem is that when I try to set the render type as single band pseudocolour in ...
0
votes
0answers
16 views

Orfeo Toolbox DEM download error

I have been trying to use the following part of the Orfeo Toolbox to download DEM data from usgs. I have been passing it a geotiff image as the reference and am receiving the following error: 2015 ...
0
votes
2answers
40 views

Equidistance on line contour from DEM

I am using a SRTM 30 meters for slope and elevation. When i'm using this 30x30 rasters to generate contours i set a 30m equidistance for contour, and the results are ok. Now i'm wondering if it's ...
0
votes
0answers
27 views

Defining and exporting a path from discrete points in QGIS

I'm working with elevation data (NED, SRTM, etc.) in QGIS and I'm wondering how I might be able to pick a set of points from my map and export the coordinates to something like CSV. For example, I'd ...
0
votes
0answers
13 views

How to import or reproject SRTM 30 sec DEM [duplicate]

I downloaded the global SRTM DEM from here. When I add the DEM as a raster layer (in my case topo30.grs file) the left/western edge of the file is at Greenwich and the right/eastern edge is at +360 ...
0
votes
0answers
58 views

How to overlay dem (100m) over MODIS (500m) in square grid?

I have SRTM Dem data and the resolution 90m approx at the equator however the resolution varies as we move from equator to poles. For my case the study area is Himalayas. My plan is to get the square ...
0
votes
1answer
74 views

How can I use the OSM SRTM plugin for Osmosis program?

I am using Osmosis and I have a test .osm map. I want to install a plugin from the following Github repo: https://github.com/locked-fg/osmosis-srtm-plugin/ I have followed the steps to "install" it ...
0
votes
0answers
93 views

ArcGIS export hgt/srtm

I just resampled an hgt-file using ArcMap of ArcGIS for Desktop. Is there the possibility exporting the resampled data as hgt file again?
0
votes
0answers
107 views

Slope and Curvature values

From an SRTM DEM I have calculated the slope of the terrain with values that range from 0 to 77 (degrees). I have also calculated the curvature of the terrain and the statistical characteristics of ...
0
votes
1answer
225 views

how to batch reclassify rasters with percents range

Using Model Builder I need to reclassify slope rasters with percents range value. I have read and ask here batch reclassify rasters with different elevation ranges, but I still need more explanation. ...
0
votes
0answers
255 views

How to import SRTM data for the whole planet into TileMill

I need to get SRTM elevation data for the whole planet into TileMill. I already walked through the instructions on Steve Bennett's blog and it worked fine for small areas. The problem is now that for ...
0
votes
1answer
272 views

gdalbuildvrt error when mosaicking SRTM data with different NoData values

I'm attempting to mosaic together 9 SRTM tiles downloaded from CGIAR to produce a DEM of Borneo. I'm using: gdalbuildvrt Borneo.vrt BorneoSRTM/*.tif where BorneoSRTM contains the 9 tif files to be ...