Questions tagged [surface]
The surface tag has no usage guidance.
50
questions
0
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0answers
5 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 ...
3
votes
1answer
69 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 ...
0
votes
1answer
27 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
1answer
23 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 ...
0
votes
1answer
114 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 ...
0
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1answer
30 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.
2
votes
0answers
36 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 ...
0
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0answers
24 views
How is Band 8 (panchromatic) of Landsat connected to Surface Reflection/Albedo?
I want to work with the surface reflection/Albedo of Landsat 8 and got told to use B8 which is the panchromatic. It catches all the visible light so it makes sense to me that it is connected but I ...
1
vote
1answer
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 ...
1
vote
0answers
368 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 ...
1
vote
1answer
157 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, ...
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0answers
38 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?
8
votes
1answer
322 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 ...
0
votes
1answer
259 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 ...
2
votes
0answers
29 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 ...
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0answers
35 views
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 ...
0
votes
1answer
142 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 ...
2
votes
1answer
157 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 ...
0
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0answers
121 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, ...
0
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0answers
88 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 ...
1
vote
0answers
54 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 ...
1
vote
1answer
218 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. ...
3
votes
1answer
419 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
1answer
1k views
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
votes
0answers
377 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
1answer
161 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
2answers
291 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
1answer
1k 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 ...
0
votes
1answer
81 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
1answer
314 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 ...
0
votes
1answer
263 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 ...
1
vote
1answer
233 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 ...
1
vote
1answer
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
0answers
295 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 ...
0
votes
1answer
567 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
vote
0answers
802 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 ...
3
votes
2answers
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 ...
0
votes
1answer
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 ...
1
vote
0answers
129 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 ...
2
votes
1answer
126 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 ...
2
votes
1answer
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 ...
1
vote
0answers
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 ...
1
vote
0answers
45 views
Change point symbol to polygon using Arcgis 10.2.2 [closed]
I would like to ask how can I convert a point symbol to polygon. I have the capital city (point symbol) and I want to visualize it as a polygon, for better cartographic representation. I'm using ...
1
vote
0answers
23 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 ...
2
votes
1answer
71 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 ...
4
votes
2answers
352 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:
...
1
vote
1answer
133 views
Creating surface area regions of minimum size from raster file using ArcGIS for Desktop?
I have these in a raster of Ontario province in Canada (both tiled and mosaiced versions) in ArcGIS
Also I have a list of dam sites. I created buffer zones around these sites, now I want to generate ...
1
vote
0answers
128 views
surface area in a basin with reference to incremental height of DAM [closed]
I want to calculate "surface area in a basin with reference to incremental height of DAM"
i tried this:
step_size = 10 # metres; reduce this if you want finer resolution
num_steps = 20 # increase ...
8
votes
1answer
4k views
QGIS calculate the 3D surface area of a region?
I would like to calculate the true surface area of a region from DEM (2D elevation data).
Is it possible to do this with QGIS?
And if yes, how?
I managed to obtain a 3D visualization of the ...
2
votes
3answers
302 views
Determining surface that reflectance curve matches?
I was wondering to what surface that reflectance curve belongs?
It is definetely no water or snow since their reflectance drops at a much smaller wavelength.
I was thinking about a dense cloud but ...
