Questions tagged [surface]
The surface tag has no usage guidance.
54
questions
2
votes
1
answer
80
views
Finding correct ellipsoid to calculate the surface of polygons (hectares) in QGIS
I would like to calculate the surface of a group of polygons in QGIS. It was not me to create the shapefile, when I add it to the project and I check its properties, it results that the geometry and ...
- 299
4
votes
1
answer
47
views
r.surf.area outputs are unclear (QGIS)
For different projects in my company the area was calculated using $area (and sometimes area($geometry) in the Field Calculator. I decided to change the surface area calculation to using the r.surf....
- 311
0
votes
0
answers
13
views
Determing altitude above mean sea level (amsl) or isobaric (hPA) levels for GFS surface coordinates
GFS provides surface coordinates for their data variables, such as for geopotential height, temperature, and u, or v wind vectors, however, it is not clear what the altitude is at the surface.
Is ...
5
votes
1
answer
96
views
Draw buffer around points considering slope in QGIS
I generated random points on a map. Around each point I would like to draw a circular buffer which considers the slope in that area, and within these circular buffers I would monitor tree height in ...
- 311
2
votes
1
answer
76
views
Searching for waterfalls / water drops within an area of interest, return location and height
Is there a system/service for finding or searching waterfalls or "water drop" (say 1.5m drop)? Or is there another (simply) way to gain this data?
finding := Input a location and drop ...
- 131
0
votes
0
answers
8
views
MODIS MOD09GA product B6 "stripes"
I'm trying to work with the MODIS surface reflectance data of B6. I'm have downloaded the MOD09GA product, and the image format is HDF.
It seems that all the images present "stripes" on B6. ...
- 3
0
votes
0
answers
24
views
How to calculate LST in ECOSTRESS data?
I have downloaded ECOSTRESS images, but the LST band values are way too high. How do I convert the pixel values to degrees celsius? Someone said they use the TES method to retrieve LST from the five ...
- 1
3
votes
1
answer
302
views
Calculate 3D area with an DEM in QGIS
I have a lot of my projects that are located in mountains. When I draw my polygones, I can easily calculate $area, of course. But in many cases, I underestimate the surface of my polygons due to the ...
- 600
0
votes
1
answer
188
views
Filter Landsat 5 Surface Reflectance Images by Cloud Cover with a Region of Interest in GEE
I'd like to filter a large collection of Landsat 5 Surface Reflectance images by cloud cover within a small region of interest (not the entire image scene) in Google Earth Engine. I know there are ...
0
votes
1
answer
45
views
Storing MultiSurface and PolygonPatches in SQL database - conversion to basic OGC geometry types
I am new to GIS.
I am working on a requirement of storing in the database administrative units (states, counties, communities, cities, etc.) as geometries (borders / areas) in order to be able to make ...
- 121
0
votes
1
answer
332
views
Cloud masking the Landsat-8 Surface Reflectance product without using GEE
I have a collection of Landsat8 Collection2 Level2 images (surface reflectance) and I would like to cloud mask those images somehow, so I can further make a time series of NDVI and other remote sensor ...
- 1
0
votes
1
answer
36
views
Adding surface in symbology QGIS [closed]
I would like the symbols to show the total area of each type of land use.
I tried to do it but I can't separate them.
- 21
2
votes
0
answers
44
views
Estimating the water coverage area behind a dam
I have a task to estimate the area that will be covered by water when a dam is built in the provided location. The only thing I have is the max water level calculated for the reservoir.
Is that enough ...
- 21
1
vote
1
answer
18
views
Land usage radius from different layer
I am very new to using QGIS but what I am trying to do is:
Load a WFS of 'land usages' in the netherlands (PDOK)
plot store locations over the land usages
take a 750 meter radius around the store
see ...
- 13
1
vote
0
answers
600
views
Error: shape mismatch when plotting certain DEM Geotiffs in 3D - using 'plot_surface' from Matplotlib
I'm trying to plot various DEM geotiff rasters in Python 3.7 using plot_surface in matplotlib but encountered an error that I can't solve. I have 2 DEM rasters, the small one plots correctly, the ...
- 445
1
vote
1
answer
265
views
Flattening lakes for hydro-flattened DEM using polygon vertices in QGIS
I have the vertices around lake polygons that I want to flatten for a hydro-flattened DEM. I know that ArcGIS has a trend tool that will create a sloped 'plane of best fit' for a series of points, ...
- 139
0
votes
0
answers
51
views
Python surface plot in qgis2threejs
I'm new user of QGIS and I would like to import a surface plot - made with python - in qgis2threejs but I don't know how can be done, can someone help me?
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9
votes
1
answer
393
views
Why QGIS 2 and QGIS 3 return different value for $area function?
I measure the area of a polygon with the QGIS Calculator: The cartesian area($ geometry) calculation function gives the same result for QGIS versions 2.16 and 3.4.5, but it is different with the $area ...
- 599
0
votes
1
answer
340
views
Python surface plot in QGIS
I'm new in QGIS and I’m having some troubles. I have produced a surface plot in python and I would like to import it in QGIS but I don't know how do that, can anyone help me?
P.S. I also have the ...
- 9
2
votes
0
answers
42
views
Creating surface layer from Points in ArcScene
I work in ArcScene where i have some buildings in 3D, on the facades of these buildings in have points of solar intensity. I would like to create a continuous surface of solar intensity for each ...
1
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0
answers
44
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How is the Point on surface tool calculated in QGIS [duplicate]
I am interested to know how the Point on surface tool works in QGIS 3. I am choosing to use this rather than the Centroids tool which works of the "center of mass" methodology because this creates a ...
- 2,728
0
votes
1
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204
views
Converting DWG surface to line feature class in file geodatabase using FME?
I have a DWG file with autocad_surfaces.
I want to export these to a line, so that I can use it in ArcGIS Pro.
How can I convert the features from surfaces to lines in an ArcGIS File Geodatabase ...
- 249
2
votes
1
answer
226
views
FME Surface Modeller "minimum number of points"
IN FME workbench 2016.1 I want to create a DEM from Multipatch-geometry contained in a geodatabase, for doing that I thought using the SurfaceModeller could work, where in SurfaceModeller I group the ...
- 91
0
votes
0
answers
145
views
Generating TIN from features in ArcGIS Desktop?
I am changing surface in some parts of area I use for project. To do that I draw polygons and add elevation to vertices using "Interpolate shape". Then I create TIN for edited parts of terrain. Next, ...
- 135
0
votes
0
answers
114
views
Set multiple values to nodata - Erdas Imagine 2015
I am having trouble with the data ranges in the Landsat 8 surface reflectance product which I downloaded from USGS. The Lansat 8 surface reflectance handbook says the valid range is 0 - 10,000 range ...
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1
vote
0
answers
63
views
Is it possible to use the L8 OLI/TIRS COLLECTIONS LAND SURFACE REFLECTANCE Landsat8 product for calculation of the surface temperature?
Is it possible to use the L8 OLI/TIRS COLLECTIONS LAND SURFACE REFLECTANCE Landsat8 product for calculation of the temperature of the Earth surface?
I examined the following sources about this ...
- 397
1
vote
1
answer
246
views
Geotools creating polyhedral surfaces from polygons
I have polygon geometries that represent building footprints in a shapefile and I want to extrude them according to an attribute "height" and turn them 3B objects as polyhedral surfaces via extrusion. ...
- 599
3
votes
1
answer
443
views
Landsat8 surface reflectance rescaling pixel
Sorry for this basic question, but I am using Landsat8 images with "surface reflectance" treatment from Landsat8.
I am having some trouble with the data from some bands. Most of pixel are beyond 10k.
...
2
votes
1
answer
1k
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Interpreting results in legend, SAGA GIS or QGIS? [closed]
Can somebody explain to me what units of measurement do I get in the results of analysis, ground morphometry in SAGA GIS software or through a plugin in QGIS?
for example:
Terrain ruggedness index (...
- 2,197
2
votes
0
answers
414
views
Error WFS (2.0.0) GetFeature spatial query with multi-surface geometries in ArcGIS Server 10.6
In the new version of ArcGIS Server 10.6 it is not possible to request GetFeature WFS with spatial filters with multi-surface geometry. The following is an example of the query:
GML3 geometry would ...
2
votes
1
answer
185
views
angle of incidence calculation
I am calculating angle of incidence by the following formula!
cos(aoi) = cos(slp) cos(zn) + sin(slp) sin(zn) cos(azm_s - azm )
aoi: angle of incidence slp: slope zn: zenith angle azm_s: solar
...
0
votes
2
answers
308
views
Client-side 3D surface generation in ArcGIS JS API
Is there any way to create some sort of 3D surface (mesh, TIN, elevationLayer) from contour lines on the client side with ArcGIS JS API? Or alternatively edit a hosted 3D surface (any format)? In our ...
2
votes
1
answer
2k
views
Download AVHRR 1 km SST data
How to download NOAA AVHRR 1 km resolution sea surface temperature data?
I need a SST 1 km image of the coast of Netherlands with at least 20 % valid pixels.
After searching and searching I find the ...
- 369
0
votes
1
answer
89
views
What is the distinction and unit of the number written in the slope field [closed]
I added a line shapefile to a surface using the Arc map 10.3
In order to calculate the 3D length and slope of each feature line
The result was as in the picture.
What is the distinction or the unit ...
0
votes
1
answer
400
views
Any way to create polygons with brush-like tool?
I’m making a hiking map for a small range of mountains. I’d like to show surface coverage, including a few broad categories of vegetation type, rock, sand, etc. I’d like to do this as vector data.
I ...
- 53
0
votes
1
answer
282
views
Surface analysis with R - Shape recognition
I am trying to analyse a geological surface with R & Python and I would like to know if there are some ways to distinguish, divide and quantify repetitive structures such as advertised by a ...
- 105
1
vote
1
answer
241
views
Landsat 7 - 8 surface reflectance bands from ESPA (LEDAPS)
I have downloaded some Level 1 and higher level imagery data including surface reflectance as well.
I should process these data in Idrisi (Selva) package.
The Level 1 images' pixel values are between ...
- 11
1
vote
1
answer
2k
views
Calculating Albedo for Landsat 8 using QGIS with GRASS?
I am trying to estimate albedo for Landsat 8 OLI. The idea was to use the GRASS function i.albedo within the processing toolbox of QGIS. However, the option for Landsat 8 OLI is not available, ...
1
vote
0
answers
325
views
Calculating normal vector distance between two surfaces using ArcGIS Desktop?
I have two surfaces mapped out from seismic data, imported as x,y,z datasets in ArcMap and then converted to rasters using the point to raster tool. These surfaces are rugose (seafloor and an ...
- 67
0
votes
1
answer
601
views
ArcGIS Surface Volume - multiple results in one table
I'm calculating volumes and surfaces using Surface Volume tool. According to the help page:
http://pro.arcgis.com/en/pro-app/tool-reference/3d-analyst/surface-volume.htm
it should be possible to ...
- 1
1
vote
0
answers
851
views
How to drap a texture over a surface with python and mayavi?
I want to add a picture over a surface that I made with mayavi and gdal.
I found a website (http://geoexamples.blogspot.ch/2014/02/3d-terrain-visualization-with-python.html) which explains how to do ...
- 483
3
votes
2
answers
1k
views
How to drape image on surface using open source software?
I have a image with a known projection - say an aerial photo. I also have a raster surface grid with the same projection - say a DEM. Both are in the same projection. Both have the same extent.
How ...
- 442
0
votes
1
answer
1k
views
How to create a layer over a surface with mayavi?
I made a program with python which displays an animation of the propagation of a fire spreading in a forest in 2D (the forest is an array):
no tree = 0.0
a tree = 1.0
a tree in fire = 2.0
Here is an ...
- 483
1
vote
0
answers
141
views
How to create multi criteria cost surface - Slope reclassification? [closed]
I´m working on thesis aimed at investigating of possible routes and paths between Mayans cities in Guatemala. My thesis should help archaeologist to locate and reveal old paths in jungle and speed ...
- 49
2
votes
1
answer
130
views
Automatic conversion to surface reflectance (SCP)
I am practicing for SCP part by using Qgis 2.10.1.
I already download desired LANDSAT image from SCP>Download Landsat.
However, in Pre-processing part, after click Select directory button, the ...
- 79
2
votes
1
answer
61
views
Half of Earth with most landmass [closed]
About 71% of the Earth's surface is covered with water and the remaining 29% is landmass*. If you could theoretically cut the planet in half, with the objective of producing a half with the most ...
- 129
1
vote
0
answers
22
views
Surface attribute only calculated for actual points and not interpolated
When I run the surface hillshade, slope and aspect in the Arc Toolbox using my raster surface it appears to be calculating the attribute only for the data points and not for the interpolated areas ...
- 11
1
vote
0
answers
24
views
Calculation surface of building external walls from shapefile [duplicate]
I have two datasets (attached):
1) A shapefile of buildings containing the height of each building.
2) A parcel shapefile. Several buildings are assigned to a single parcel.
I am interested in ...
- 21
2
votes
1
answer
77
views
Getting exact maximum daily temperature using remote sensing?
I have a problem I want to find the land surface temperature of Bangkok using landsat8.
I have everything to get it but the problem is landsat images are obtained during morning time but the maximum ...
- 29
4
votes
2
answers
362
views
Easier calculation of a surface using QGIS
I'm looking for an easier way to calculate the surface on QGIS:
My project CRS is in Lambert93.
Currently, when I'm calculating a surface using QGIS, when the surface seems wrong, I always have to:
...
- 41