Questions tagged [hgt]
A format where SRTM files are encoded in
31
questions
1
vote
1
answer
39
views
How do I fix the average shading of many .hgt tiles in QGIS?
I downloaded many .hgt files to map California. When I open them in QGIS, the borders line up perfectly, but the average height shading is different for each .hgt file. Is there a way to average out ...
- 13
0
votes
1
answer
243
views
Batch conversion of .hgt files to .tif using Powershell returns filename.hgt.tif files
I have a folder which contains DEM in .hgt. I want to convert them via GDAL. So to convert a single file, it's gdal_translate -of 'GTiff' N16E122.hgt N16E122.tif. To do it in Powershell, I figured it'...
- 1,217
2
votes
1
answer
170
views
Can I create .las or .laz files from .hgt, .tiff, .gpx/kml or .asc files?
I have got into a golf simulator game and want to recreate my home course. Problem here is that the only import way for height information is a LAZ or LAS file. So I am looking for a way to work ...
- 29
1
vote
0
answers
215
views
Bad result when extract slope from HGT using GDAL
I'm trying to generate a slope tif from a HGT DEM file from SRTM.
I'm following this posts:
https://blog.mastermaps.com/2012/06/creating-hillshades-with-gdaldem.html
https://blog.mastermaps.com/2012/...
- 2,110
2
votes
0
answers
3k
views
SRTM HGT to GeoTIFF conversion using GDAL
I have (for example) SRTM-1 file n48e083.hgt with resolution 3601x3601.
What is right way to convert it to GeoTIFF?
gdal_translate -srcwin 0 0 3600 3600 -a_ullr 83 49 84 48 n48e083.hgt n48e083.tif
or
...
- 21
0
votes
0
answers
177
views
How to place point information in a .hgt file
I am a noob when it comes to LiDAR data. I normally work with las, lasx or las tiles to create golf courses from around the world for a game. I have recently have had a request to create a golf ...
- 101
0
votes
1
answer
236
views
Unable to open hgt downloaded from dds.cr.usgs.gov
I downloaded a SRTM hgt file from https://dds.cr.usgs.gov/srtm/version1/SRTM30/w100n40/w100n40.dem.zip, after unzipping I am not able to open it in QGIS or even gdalinfo. I downloaded other hgt files ...
- 3,454
1
vote
1
answer
482
views
Reading same hgt file downloaded from two sources
I have two tiles for SRTM1 for the same bounding box region, but downloaded from two sources.
I read a value for a given latitude and longitude with python.
I get always a difference of one meter for ...
- 335
1
vote
0
answers
391
views
How to specify HGT file name in gdal_translate command?
gdal_translate command is generating a HGT file with user defined name but its giving an error as `N5464347W74.hgt' not recognized as a supported file format. Below is the command and the entire ...
- 133
0
votes
1
answer
545
views
Print elevation of different coordinates from .hgt file [closed]
I am trying iterate through the data(elevation) from .hgt file. I have attached the codes which i used to get the elevation from the file.
from gmalthgtparser import HgtParser
hgt_file='N09E076....
- 11
2
votes
2
answers
5k
views
How to open .hgt files on QGIS 3.2?
I have downloaded a hgt file from EarthExplorer but when I try to load it on QGIS I get an error "GDAL provider cannot open GDAL dataset".
I was under the impression that hgt files were supported. It ...
- 951
0
votes
0
answers
611
views
Generating a Map (like Google Maps) using HGT files
I'm doing a programming project. It consists of generating a Map (like Google Maps) from height files .HGT
Currently, I can read each file .hgt (each .hgt file have 1201 * 1201 elevation data). For ...
- 101
1
vote
1
answer
865
views
Getting correct elevation from hgt file [closed]
When reading SRTM3 data from a .hgt file I get the wrong elevation of a specific latitude longitude and I can't see why.
Maybe someone can see the problem ?
My coordinate is near Lissabon in the sea ...
- 151
1
vote
1
answer
2k
views
How to open .hgts file from NASADEM data
I have the NASA SRTM1 data as .hgt files from their ftp website, but I would have these elevation data in respect to WGS84. I found by NASA's ftp site a folder named srtmOnly that contains what I want,...
- 335
1
vote
0
answers
1k
views
Which DEM format is efficient .tiff or .hgt
I know this is a vague question, but I've no expertise in GIS world. I was building this terrain map for a game like simulation project that I'm invested in. Data accuracy is least or no concern, but ...
- 11
1
vote
1
answer
163
views
r.viewshed output location
I'm very new on GRASS and trying to extract the viewshed of a SRTM HGT file.
This is what I've done so far:
(why I'm using GRASS command line this way is not in question. Please answer this same way)
...
- 2,110
1
vote
1
answer
2k
views
Extracting data from hgt files?
SRTM3 .hgt files have 1201*1201 DEM elevation data, I extract .hgt files data elevation into file Elevation.json with index.js with the help from this GitHub project.
Then I rename Elevation.json ...
- 335
2
votes
0
answers
252
views
Generating HGT Files from SRTM 90m Digital Elevation Database v4.1?
This may be a really dumb question and I apologize if it is - this is pretty new to me.
I'm using the HGT files from https://dds.cr.usgs.gov/srtm/version2_1/SRTM3/ with a program currently and want ...
- 45
1
vote
1
answer
1k
views
Splitting and converting a large tif files into multiple .hgt files
I'm quite new to GIS format and conversions, so be patient with a newbie. I got stuck on a file conversion and I'm looking for some help this to fix my scripts. I have a big 5 GB tif file with a ...
0
votes
1
answer
677
views
Geo transform matrix
What does it mean "Source image must have a geo transform matrix" during gdal_translate when I want to export geotiff to .hgt file. I know what a matrix is, but don't know how to make one.
3
votes
2
answers
1k
views
SRTM data represented in 3D using Unity. Problem texturing with sat images
I'm currently working on a project that represents geographic data in 3D using Unity. It basically loads, when given a GPS position, the area around it. For example, given the coordinate 50.5N 6.5E it ...
- 41
2
votes
1
answer
548
views
Why there's a break between each .hgt srtm tile when importing to QGIS?
When I import the .hgt srtm elevation data to QGIS, the each tiles(each .hgt files) stitches with with a break or contrast variance or something like this:
And it gets worst when rendering it with ...
- 21
0
votes
1
answer
184
views
postgis SRTM3 different raster scale in same column
SRTM3 elevation data are stored in HGT files each containing 1201x1201 values. I want to store this information in a PostGIS raster column with a single band.
To optimize my queries, I wanted to ...
- 111
1
vote
0
answers
728
views
How get latitude, longitude and altitude from SRTM SWBD and .hgt files in one table
I know this question may seem repetitive but I am not able find a solution hence I am asking this question .
1)I have downloaded OSDM data, SRTM SWBD data and also the corresponding .HGT file ...
- 21
1
vote
1
answer
902
views
dt1 to hgt conversion
I have an application that generally uses .hgt files for 3-arc-second resolution of elevation data. A military user has asked us to use .dt1 files (also 3-arc-second resolution) that they have ...
- 13
3
votes
0
answers
204
views
Questions about SRTM , .hgt format and the sea level/coastline [closed]
What a nice place here ! The questions/answers system is very elegant.
I have read and get some useful informations allowing me to write a little .hgt reader...
I am working on C.G.I and create 3d ...
- 31
0
votes
1
answer
3k
views
QGIS 2.2: GDAL Grid (Interpolation) Error
As much as i understand Raster -> Analysis -> Raster (Interpolation) can provide me with a terrain file out of a shape file with a Z coordinate.
I select the input and output file and a Z field.
It ...
- 43
4
votes
2
answers
3k
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 ...
- 139
2
votes
1
answer
2k
views
Conversion from CGIAR GEOTIFFs to SRTM3 like HGTs
Im writing a C program for querying height information from SRTM data. Since reading directly GeoTIFF format is tough job, I decided to load HGT format, which serves great for the purpose.
Since ...
- 181
6
votes
1
answer
3k
views
How can I convert a tif or xyz file to HGT?
Due to system incompatibilities between projects, I have been asked to convert my DEM which is in geotif format to HGT.
I have no experience with HGT and cannot find any export options to this format....
- 10.2k
3
votes
2
answers
2k
views
Loading .hgt file in SAGA GIS
I want to display and work with the data from http://dds.cr.usgs.gov/srtm/version1/Eurasia/
in SAGA-GIS but am having difficulties knowing which module I should use to load the data.
As far as I know ...
- 10.2k