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Questions tagged [surface]

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25 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 ...
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1answer
50 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
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1answer
43 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 ...
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0answers
52 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, ...
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0answers
50 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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0answers
36 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
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1answer
124 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. ...
2
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1answer
283 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. ...
1
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1answer
573 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
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0answers
242 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
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1answer
86 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 ...
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2answers
179 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
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1answer
933 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
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1answer
71 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
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1answer
141 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
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1answer
173 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
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1answer
206 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
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1answer
1k 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, ...
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0answers
226 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
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1answer
442 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
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0answers
534 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
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2answers
782 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
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1answer
699 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 ...
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0answers
96 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
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1answer
96 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
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1answer
56 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
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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
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0answers
42 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
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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
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1answer
56 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
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2answers
310 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
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1answer
111 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
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0answers
91 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 ...
3
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1answer
3k 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
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3answers
266 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 ...