Questions tagged [surface]
The surface tag has no usage guidance.
65
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Getting the right surface area raster layer
I am calculating the surface area of a raster file and even though I have tried to put it in all sorts of projections it still shows dg2. I have now used the projection equal earth greenwhich which ...
0
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1
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48
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Polygon envelope. Contour and total surface
I'm starting out using ArcGIS and I don't know how to get the perimeter of a polygon set.
The resulting layer has to be the total surface area of the polygons that form it. could someone tell me how ...
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1
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1
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30
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How to use GeoTools GML types in pidf-lo generated classes
Using shape classes generated from opengis https://schemas.opengis.net/gml/3.1.1/profiles/geoshape/0.1.0/ results in classes using this generated values, i.e:
public class PrismType extends ...
- 11
6
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2
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246
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Getting perimeter for each polygon without shared sides in QGIS
I want to get the perimeter of each polygon (building) I have. Some polygons are adjacent, thus sharing a side. Shared sides should be excluded from the calculation for each polygon. In simpler words: ...
- 907
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90
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QGIS converting MultiPolygon to MultiSurface - can I disable QGIS from doing this?
I have MultiPolygon data stored in a PostgreSQL DB (13.9) and am editing this through QGIS (using 3.28.3-Firenze). Occasionally when editing, some features are saved back as MultiSurface features. ...
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59
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Different volume results in QGIS by using Raster Surface Volume and raster statistics
I have seen many questions similar to mine, but did not find an answer to my problem. I am using QGIS version 3.28.11-Firenze.
I have a raster representing the difference between two DEMs on a fluvial ...
- 11
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0
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584
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Calculating LST from Landsat 5 in Google Earth Engine
I'm trying to write a code for Land Surface Temperature (LST) from Landsat 5 images in Google Earth Engine. I'm using the code of this question as a guide and I succeeded but I'm not sure to be right ...
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55
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QGIS XYZ to 3D coloured contoured surface [closed]
I am using QGIS. I have XYZ data in a CSV file. I want to show it as a 3D surface that is contoured (every 10’) and is coloured between contours. The z data is below sea level so negative. I can ...
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43
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How to create a surface from a raster which goes through all the local maximum altitudes of my raster using QGIS?
I am struggling to create a surface from a raster using QGIS. The surface needs to go through all local maximum altitudes of my raster (tangent to vertices) and needs to have some kind of smoothed ...
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153
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Standard deviation of interpolated data
I have a dataset with air-quality measurements in several points across one state, through several months. Thus, for each point I can calculate average, variance and so. My goal is to interpolate data ...
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79
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Create surface from LiDAR and shapefile extents
I am trying to create a TIN surface from LiDAR points and the extents of a shapefile, so that the whole shapefile is filled with a surface based on the available point data. If I create a TIN surface ...
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110
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Polygon division by multiple surfaces in QGIS
Image for example. For plan and csv file.
The final result, initially it was a large polygon that was divided according to the surfaces.
Data in the csv file
I want to detach the polygon according ...
- 11
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0
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27
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Calculating relative surface of 3band raster image in QGIS
I am trying to calculate the (relative) area of this image. It is a scan of a tree, the colors indicate the moisture in the stem. If I load it in QGIS, I see 3 bands, the combination of which define ...
- 61
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178
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Why is ArcGIS calculating polygon area twice bigger?
I am trying to determine size of surface area of the examined patches. I drew a polygon on the outlines of the patches and used geometry to calculate the area (following this video: https://www....
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1
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97
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Getting watershed area corresponding to each erosion severity class for each slope class in ArcMap
I’m new to this.
I have two (watershed) rasters: soil loss (erosion) by severity; and slope. For each erosion severity class (listed below), I would like to obtain the watershed area that falls under ...
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211
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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 ...
- 523
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1
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144
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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....
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437
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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 ...
- 615
2
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1
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256
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Searching for waterfalls / water drops within an area of interest, return location and height [closed]
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
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1
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1k
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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 ...
- 1,688
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1
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787
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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 ...
- 21
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349
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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
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564
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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 ...
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1
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47
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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.
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250
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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
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1
answer
34
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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
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0
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993
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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 ...
- 483
1
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2
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594
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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, ...
- 189
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85
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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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563
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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 ...
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464
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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 ...
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56
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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 ...
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52
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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 ...
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491
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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 ...
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1
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462
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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 ...
- 141
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209
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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
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148
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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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106
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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
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1
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368
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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. ...
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3
votes
1
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477
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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
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1
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2k
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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 (...
- 2,407
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501
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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
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1
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378
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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
...
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2
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349
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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
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1
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2k
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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 ...
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103
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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 ...
1
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1
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692
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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 ...
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342
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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
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1
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282
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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 ...
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2k
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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, ...
