The vertical distance of a point or object above or below a reference surface or datum (generally mean sea level).
2
votes
1answer
49 views
Add Surface Information in 3d-analyst
One of our guys is using the "Functional Surface->Add Surface Information" feature in 3D-analyst tool in ArcMap 10.1 to add elevation data to an XY list. It's the only feature we're using from the ...
2
votes
0answers
147 views
Correct DTED vertical datums
I have a standard DTED data. DTED data vertical datums are specified using EGM96 geoid.
I would like to correct these DTED data vertical datum in a way their are referred to the WGS84 vertical datum ...
1
vote
1answer
402 views
Help with technique to create contours from ASTER DEM in Phnom Penh, Cambodia
I have the ASTER version 2 DEM of Cambodia. I want to use it to create 1m contours of Phnom Penh, Cambodia. If anyone has this already please let me know. Now, onto the problems:
I am using ArcGIS ...
1
vote
1answer
65 views
How to apply DEM elevation adjustment parameters?
I have a nice DEM, created from UAV data, which I want to process further in QGIS, my platform of first choice. In order to represent the evelation of each pixel correctly, I have to adjust the ...
1
vote
2answers
321 views
extract elevation values along a line using Google Elevation API
I note that there is the Google Elevation API.
I see they have an example at the bottom showing an elevation profile for a line. Is there a premade service someone has put up on a website for me to ...
1
vote
1answer
215 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
2answers
466 views
Calculating slope over distance from raster
I am sitting with an elevation raster, trying to produce a calculation for slope angle. I have a cell size of 2,-2 and I am trying to figure out how to calculate cell value difference between adjacent ...
1
vote
1answer
75 views
Read height data from Meridian 2
I'm having difficulties reading the Gridded height data (OS Meridian 2). I'm loading with OSGB 1936 reference system but have trouble finding the lat/lon data for each point. i.e.I open the attribute ...
1
vote
1answer
212 views
How to calculate an hypsographic curve of a raster trhough a DEM
I am using Arcgis 10.1.
I have a MODIS raster from the NSIDC website with a pixel resolution of 500 m and an attribute table with the fields 'VALUE' (as the code of snow, clouds, etc.) and 'COUNT' (as ...
1
vote
1answer
432 views
Why does QGIS Profile from Line tool give me the same value for every point?
I'm trying to make an elevation profile with QGIS's Profile from Line plugin. But when I do, the resulting points all have the same value: -32,767. I'd like to know what I'm doing wrong.
My elevation ...
1
vote
2answers
429 views
Mosaicing LIDAR files in ArcGIS 10
I have a number of LIDAR files (the extension is .adf). When put together, they show the same area (each shows one part of it), so, before I do anything else with them, I would like to combine them ...
1
vote
1answer
192 views
Converting GPS heights to AHD heights
I was wondering if there is a way to convert heights that are logged from a normal bluetooth GPS to AHD heights.
1
vote
1answer
45 views
Python GDAL: find out spikes and pits in DEM
I'm working with on a DEM (Geotiff) in Python GDAL, and I'd like to find out the spikes or pits in my terrain.
I have no idea how to proceed, does anyone have good algorithm to help me out?
Thanks,
eo
...
1
vote
1answer
71 views
Which horizontal unit is used on the table of the Profile Tool?
Does anyone knows what horizontal unit is used on the table of the "Profile Tool".
Vertical is in meter but I don't know about the horizontal axis.
Knowing the length of my profile, I tried to divide ...
1
vote
1answer
97 views
calculating terrain elevation line
I found too many hits on the web to even see the right direction to go.
I have to provide a small proxy server serving requests for a line
of terrain elevation data between two coordinates.
It is a ...
1
vote
1answer
99 views
How to correlate raster map and elevation data?
I have been provided with a set of raster maps. Thanks to another helpful user here I have been able to acquire some elevation data for the same region from gis.utah.gov in asc format. Now I need to ...
1
vote
1answer
99 views
ESRI ISurface.GetElevation is extremely slow compared to GlobalMapper
I'm using ISurface.GetElevation on a Raster to get the elevation for a specific lat/lon.
I have to do this for a huge set of datapoints.
Currently i'm testing with a dataset of 10.000 items which ...
1
vote
2answers
553 views
How to get the altitude of the vector shapes from DTM raster layer?
I have a vector layer containing thousands of vector shapes/polygons and a raster layer with DTM. Every shape has its own OBJECTID in attribute table. I would like to get the altitude of every shape, ...
1
vote
1answer
13 views
3D and 2D lengths of lines in ArcGIS
I have a 2D road segment and convert it into 3D using a raster in ARCGIS 9.3. So, what i see is that the length of 3D road segment is still the same as the 2D road. How can this be? As due to ...
1
vote
0answers
84 views
Can Elevation Profile data in Arc's Flex Viewer 3.0 be exported?
a related thread here: google earth profile used in mashup or flex
Would like to export the elevation profile data (csv, txt, etc.) from Arc's Flex Viewer 3.0 as it creates one:
Also, if there is a ...
1
vote
0answers
74 views
Programmatically download NED tiles?
I used to download 1/3 arcsecond elevation geotiffs from extract.cr.usgs.gov using web services. But a few days ago, that stopped working, probably because USGS reorganized their site. I tried ...
1
vote
0answers
46 views
Process to load elevation data into Oracle 11G
We have the National Elevation data set from USGS and considering loading it into Oracle (11G) database.
Can someone help with the process/steps?
1
vote
0answers
62 views
How to find locations on a conditional search
Hope you can help
I have a set of points evenly distributed to 500m intervals, and stored elevation.
I want to find from a given location any other point with the lowest elevation within a 1,000m ...
1
vote
0answers
238 views
How to create a profile with profile points at discrete altitude intervalls, e.g. each 10 m
In both SAGA and QGIS theres a profile-from-line-function that does a nice job of creating profiles. But there's no way to control the altitude spacing.
Any ideas for workflows that would allow me ...
1
vote
0answers
180 views
Read negative elevation data from NASA png tiles
I query NASA JPL service using query string. Response is a unsigned 16 bit per pixel png image and the values are elevation values in meters. Same is described in the capabilty xml of the layer as can ...
1
vote
3answers
1k views
Where can I download 1 arc-second elevation data for Canada other than Geobase?
Can someone suggest a source for Canadian elevation data better or equivalent to 1 arc-second?
I have a good data source for Ontario but for other provinces folks often recommend Geobase which claims ...
0
votes
1answer
557 views
How to load National Elevation Data into a WMS server?
We have an application that can pull WMS data from the National Elevation Data set (NED) and use it to perform a number of run-time calculations. We have been pulling it from NASA JPL WMS servers ...
0
votes
1answer
202 views
Calculate maximum and minimum elevation for a polygon layer from a DEM [duplicate]
I have a polygon layer and would like to know the min and max elevation within each polygon. My elevation layer is a digital elevation model. I'm not quite sure how to extract that information.
I am ...
0
votes
2answers
263 views
Why does only one of three elevation rasters display correctly?
I downloaded a selected sub-set of the USGS National Elevation Data (NED) using their online GUI. This download came in the form of three files.
The names of the files are 61471006, 61471006_2, and ...
0
votes
1answer
17 views
ArcScene wont open a high resolution DEM and tells me to select a subset - but how?
I'm using ArcGIS 10.0 and trying to open a digital elevation model in ArcScene. I'm working on a project and got the DEM data from official sources.
The resolution of the DEM is 1 meter which is ...
0
votes
0answers
28 views
How do I add elevation data to a GeoJSON line from a GPX file?
I understand that elevation can be added as an optional third value in Coordinates (lat, long, elev) in a geojson file, but I can't find a way to actually do that from a gpx file. I've used ogr2ogr to ...
0
votes
0answers
13 views
Which all columns should I add in postgresql table so that it stores elevation values and displays them in Geoserver?
I am using geoserver and postgresql. I imported raster (.tif) file to postgresql using raster2pgsql. The file thus imported creates a new table in postgresql. But when that file is previewed in ...
0
votes
0answers
25 views
(.NET) Get DTED Data (Elevation) Between Two Points
I want to get DTED data (elevation) between two points (on a line).
Is there any built-in function for this purpose or I should implement it on my own?
What I want is similar to Linear Line of Sight ...
0
votes
1answer
58 views
Elevation difference
I want to get the elevation difference between two points in a river at a regular interval in ArcMap 10 ? I have a criteria to select the point, criteria is minimum distance between two points is 500m ...
0
votes
0answers
22 views
How to extract elevation data from DEM along a polyline [duplicate]
I've been trying to use qGIS to extract and save as an attribute the data elevation along a line, knowing that something similar is available in ArcGIS using the Spatial Analysis tool. So far, ...
0
votes
0answers
540 views
How to select an area in a raster map that is compared with another raster map? (intersection of two raster maps) [closed]
I have
raster map A=elevation values and
raster map B=raster with colors (each color represents a polygon boundary. raster map B is created with the use of v.to.rast)
I want to select the part of ...
0
votes
0answers
486 views
buildings shadow areas calculation
is it possible to calculate shadow areas of buildings or simulate shadows of buildings in a city using e-cognition software, with the DSM of the buildings and the sun angle and azimuth known?....if ...
