Questions tagged [geology]

The science of structure, composition and development of Earth and other planets. Mostly concerned with planetary processes and resources.

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3D Geological modelling / grade shells

I have been using the Geoscience plugin to visualize downhole assay and geological data and it works superbly. Is there any software similar or additional to this in which you can link grades / ...
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32 views

Displaying raster images vertically in QGIS 3.x (Geological cross section)

I'm aware this has been asked before to an extent, but the answer here doesn't really cover raster images. I want to 'hang' a raster image in 3D alongside a surface. The raster is a geological cross ...
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1answer
22 views

Removing Overlapping Outlines Within a Single Feature Class

I have a polygon feature that is overlapping itself. Both of the polygons in the image below are from that same feature. I do not want to dissolve the boundaries, but I only want one of the outlines ...
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1answer
122 views

Interpolation of 3 borehole data

I have three points (boreholes) on the map. I created them using shape file layer. Each borehole shape file layer shows the strati-graphic section of the ground. (i.e. between 0-50 m = Gravel , 50-60 ...
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113 views

Visualizing 3D focal mechanism (beach ball) in QGIS

Currently, the qgis2threejs plug-in in QGIS allows users to use a 3d model as symbology for point vector data. I made a 3d focal mechanism template (beach ball) and used it in qgis2threejs: You can ...
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242 views

Structural geology SVG symbol library

Is there a public source with an SVG library of symbols for structural geology mapping in QGIS ?
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31 views

Finding sericite alteration in ENVI 5.3 spectral library?

I work on an area where there is a sericite alteration and i searched for the sericet and did not find a word. I want to know what is called sericet in the spectral library of ENVI 5.3? Sericite is ...
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1answer
83 views

Populate data with underlying geology in Mapinfo [closed]

How do I add geology from polygons from a tab file (vector geology map) to a geochemical point data tab file, both in Mapinfo? If I can add the underlying geology to the geochemistry file then I can ...
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71 views

Georeferencing dogleg geological cross-section image in QGIS?

We have hundreds of geological cross-sections which has to be georeferenced (Eg: Image 1. Highlighted part). Currently, we are using GeoSoft to georeference the section's by assigning proper depth ...
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1answer
94 views

Creating 3D polyline just below another polyline using ArcGIS Desktop?

I have a geological setting where I would like to add a lithology to an existing map. I already have the 3D polylines from my geological map and the DEM I now want to add another polyline between two ...
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194 views

Displaying cross sections/3D volumes in QGIS 3.X

Is there is a way to display vertical images (cross sections) in a 3D view window in QGIS 3? I want to display some cross sections underneath a geological map overlain on the topography. I can do ...
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1answer
51 views

Creating a constant surface at designated height above river [closed]

I am trying to create a polygon (and eventually a raster) surface of river deposits that have since been eroded away. We know that at maximum, deposits got up to 600 ft above the present river. Given ...
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57 views

Kriging: Large standard error very close to known value points

I am attempting to create surfaces of strata via Kriging in Arc GIS from borehole data. In addition to the predicted surface I also want surfaces showing 95% confidence above and below the predicted ...
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1answer
309 views

Automating subtracting two layers in QGIS?

Using QGIS, I would like to calculate the difference in depth between several geological horizons. I have one horizon that covers a large area (horizon1) and several smaller horizons (horizon2, ...
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2answers
117 views

Hacking QGIS plugin Midvatten to allow capacity explanation label on stratigraphy plot?

I have been trying to make a local addition to the python code for QGIS plugin Midvatten to allow labels on the stratigraphy plot that give the capacity explanation rather than the capacity value. In ...
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125 views

How to add a OneGeology Layer to a Leaflet Map [closed]

My question is a continuation of Combine Leaflet with Geoserver WMS map (asked by someone else. I also understand the JavaScript in that post - my Q is not about javascript or leaflet). However I ...
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1answer
173 views

QGIS Midvatten stratigraphy plot issues

When I use the stratigraphy plot function in Midvatten on an East Anglian coast quaternary data set (West 1980) that I have been digitizing, I find that the upper layers of strata disappear at the top ...
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2k views

USGS/FGDC SVG geoscience point symbols for use in QGIS

I have over 700 symbols created and tested for use on geological maps, using the USGS symbol documents as a source (https://ngmdb.usgs.gov/fgdc_gds/), converting the original PDF using Inkscape. I am ...
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1answer
61 views

Finding Rocky Outcrops

I've been asked by one of my users if it's possible to find "Rocky Outcrops" in an area. They don't really have a definition for what that means, it's a very open ended question! My feeling is that ...
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1k views

How to create 2D or 3D cross sections from geological borehole data in QGIS

Is it possible to load borehole csv data that contains x, y, z coordinates into QGIS and create cross sections of the strata? It is data along a rail line so a DEM is not suitable. Just a 2D cross ...
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1answer
477 views

How to show slope directon and angle [duplicate]

I need to create a map showing slope direction and dip angles in QGIS. How do I get either: the dip angle to show up next to the direction arrow or the dip arrow symbol to change depending on the ...
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2answers
298 views

Small coordinate offset on QGIS using CRS ETRS89 / UTM zone 30N

I'm currently trying to produce simplified field slips on QGIS for an undergraduate mapping project in Villamanin, Northwest Spain. I've imported vector map layers from the download centre from the ...
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2answers
873 views

Plot beachball (focal mechanism) for earthquake in QGIS?

I'm drawing earthquakes on the map using QGIS and I need to plot focal mechanism by beach balls. I don't want to use svg because it need to transform new locations on the map. Is there a plugin or ...
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1answer
105 views

Cannot convert OneGeology KML to layer file in ArcGIS Desktop?

I downloaded and saved a KML file of Indonesian geology from OneGeology Portal (http://portal.onegeology.org/OnegeologyGlobal/). However, when I use the KML to Layerfile tool in ArcGIS, the tool does ...
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1answer
179 views

Extracting stratigraphic profiles from multipatch features representing continuous geological formation in ArcGIS Pro?

I have some multipatch undergroud layers representing each a specific geological formation unit. These units are vertically continuous and I'd like to "clip" them with an orthogonal plane to extract a ...
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36 views

Defining soil classifications for Green Mountain National Forest based using SSURGO data [closed]

I'm a third-year undergraduate biology major with a focus in ecology. Referencing the methods laid out in A quantitative approach developing regional ecosystem classifications (Host et al 1996) I ...
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1answer
55 views

Displace polygons from each others?

I am working on generalization of Geological map generalization and as part of it I am dealing with displacement of polygons from each others. Because, in previous steps I enlarged small polygons ...
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1answer
1k views

Identify shape of the polygons: elongation, roundness, etc

I am generalizing geological map. In the initial step I am dealing with small polygons which should be either deleted, enlarged, aggregated and etc. Before applying operations mentioned above I ...
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2answers
2k views

Calculate radius from magnitude of earthquake on leaflet map?

I have a working leaflet map that is showing earthquake data from http://earthquake.usgs.gov/. I'm trying to figure out the "right" way to calculate the radius of the circle for an earthquake given ...
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1answer
432 views

3D ground model with open source software?

I am looking for some open source software to plot some borehole logs and create a 3D ground model. I used to work in a mining environment and used software including Datamine and Mapinfo Discover to ...
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121 views

How to plot different style of faults using matplotlib?

I want to plot faults with different styles such as normal, revers and strike-slip. As any of them has their own styles in geological maps, I have to plot them with a unique symbols. Up until now I ...
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1answer
486 views

Create shapefiles from SEG-Y files?

I am working with seismic data. Previously we had a tool or a script that could scan these data (SEG-Y) and produce a polygon and shapefile based on the header info from the SEG-Y-files. This ...
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2answers
237 views

Match color style of several shapefiles

I have several shapefiles that depict the geology of an area. I'm having a hard time to match the colors for the common geological formations of these shapefiles. Can you please guide me? I can do it ...
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1answer
846 views

Visualizing XYZ data in ArcGIS Pro?

I am pretty new to ArcGis Pro and would like to import (near surface geophysical data) which are available as x/y/z/p(arameter/value). The x/y locations are in UTM so no local coordinate system is ...
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1answer
326 views

Band combinations for identifying limestone quarries

What are the most useful band combinations for identifying current and recently closed limestone quarries (Landsat 5 and Landsat 8)? In particular, for a dry sparsely vegetated region like much of ...
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1answer
224 views

Does raster interpolation recognize multiple z values for one x, y point?

I am working with lithological data, where I have multiple z depths for one set of coordinates. How is this read by the raster interpolation toolset? Does it utilize only one or all of these z values? ...
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1answer
165 views

Digitizing geological information with MapInfo?

Due to vast information included in a geological map, I really need to find a way to digitize some features (mostly lines) in a rapid way. "Click-by-click" method will cost me some millions of years ...
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2answers
334 views

Paint relief according to geology

I have created this shaded relief image in arcmap (first image). Is there a way to paint part of it according to geology and keep the relief texture (like the green color on the second image)? ...
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1answer
206 views

VTK format display problem in Paraview+GRASS

I would like to create geological 3D model from lithological layers of an area.I have converted the raster file to VTK(r3.to.vtk command) in GRASS and intended to display it in Paraview. Although I ...
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1answer
671 views

How to interpolate subsurface geology from borehole data [duplicate]

I have borehole data (x, y, z values for each subsurface measurement, and its associated lithology). I would like to interpolate the borehole data to create 1) interpolated subsurfaces and 2) ...
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1answer
124 views

geology problems: three-dimensional fault line - r.plane (GRASS) from polyline

I should use the r.plane script (GRASS) but imputing a polyline (trace of my fault line) and not a point; is this possible? I could use batch process, but I should be charged a lot of points and then ...
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1answer
173 views

How to do diagram block with open source software?

I would like to do a block diagram (topographic and geological representation). Is it possible to do this with QGIS (or other open source software), in Windows 7?
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1answer
179 views

Seeking symbology (.lyr?) for USGS geologic maps?

I work a lot with USGS geologic maps and always have the same problem. I am able to download the files from the website (in .e00 format), and make a nice shapefiles out of them. My problem is that ...
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2answers
602 views

Can LiDAR differentiate between rock and soil?

Can LIDAR by itself, tell the difference between rock (large and small) and soil? I'm under the assumption that the answer is no. However, I wanted to check here with the experts as I was told by ...
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114 views

QGIS as Spatial Database RAD or Hierarchical Attribute Viewer/Editor?

I have designed a geological observational spatial database in PostgreSQL/PostGIS to manage geochemical samples, QAQC and geological map objects. Now is the not so fun/easy part of designing a front ...
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99 views

Python for validating domains

I need to create a Python code for validating domains compared to another set of domains. The initial premise here is taking Collector data, downloading the attributes, and comparing certain domains ...
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1answer
128 views

ArcMap: Raster layers, how to extract information

I have several raster layers which represent particular geological formations. Each layer is a raster dataset in a grey scale. Each cell has a pixel value which is an elevation of the bottom of a ...
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1answer
88 views

How can I make a polygon from intersecting lines of different layers in QGIS?

I am constructing a geological map which involves constructing boundaries to areas which vary in style across their length depending on how well defined they. To do this I have created two distinct ...
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3answers
5k views

Seeking geology fill pattern libraries for QGIS?

I'm making a geological map using QGIS but I don't know how to draw a limestone lithology in QGIS. To draw other lithologies I combine lines and dots in the best possible way but that is very ...
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2answers
922 views

Most recent tectonic plate data

What is the latest update to the positions of the tectonic plates? Does anyone have a most up-to-date shapefile or vector of the tectonic plates?