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Questions tagged [topography]

The study and mapping of land surfaces, including relief (relative positions and elevations) and the position of natural and constructed features.

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1 answer
379 views

Creating elevation profile from line feature, DEM and also polygon layer inside graph, using ArcGIS Pro

I´m new to ArcGIS Pro. I have: DEM, Line feature (river) and A vegetation vector layer (polygons). I would like to make a profile from this line feature (the river), and if it is possible to show in ...
1 vote
1 answer
527 views

cut/fill calculation tool to investigate if there is enough material to achieve a 30 degree slope

This is a cut/fill problem. We have pits that have been dug in the ground, usually rectangular. They have a bund wall around them. They are being rehabilitated by pushing the bund back into the pit. ...
0 votes
0 answers
42 views

Topographic correction

I am trying to code the topographic correction and I get this error: "Image (Error) Image.constant: Parameter 'value' is required." I have seen a similar script for an entire collection, ...
0 votes
1 answer
343 views

Level curves in ArcGIS map - elevation - topography

I am using the ArcGIS web map and need to add a contour map (level curves for Uruguay) to perform a topography analysis. I have seen that in the ArcGIS Online search engine there are some maps of this ...
0 votes
2 answers
272 views

Trying to get topography via elevation package Python

So I'm trying to get some topography. In Detail some parts of the panama canal. I tried using the elevation python package. Here is my code so far: import elevation min_lat, max_lat = 8.0, 9.5 ...
0 votes
2 answers
110 views

Why is $length not giving me correct values?

I'm attempting to make a topographical map of Death Valley National Park, CA. I'm using EPSG:26911 and having an issue with filtering by length. In order to get rid of all of the tiny geometries that ...
4 votes
1 answer
15k views

Assigning z values to depth curves in QGIS

I'm new to QGIS and working with GIS in general (as a student of architecture). I have obtained shapefiles with topographic curves of an ocean floor. My intention is to export these as CAD files and ...
2 votes
0 answers
20 views

Completely new to GIS, how do I extract the pic of a certain elevation from the ETOPO .tiff file

So I started learning QGIS a week ago to do an alt-geo map and .tiff files from what I have read contain several image files displayed as 1. Is there a way for me to export specifically the PNG that ...
2 votes
1 answer
346 views

QGIS smooth mapzen DEM to create a very simplified topographic map

I am using Mapzen global terrain to create a topographic map. How can I get a very simplified result like on the map of Greece? Should I use contours lines ? And how to smooth them ? (wich algorithm ...
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0 answers
74 views

Topo correction

How can I address the problems associated with the hills shadows in GEE, as shown in the screenshot attached? It brings a lot of complication. AN IMAGE USED // Filter to 2019 Landsat 8 images over ...
1 vote
0 answers
61 views

Problem interpolating point shapefile QGIS

I've been having a lot of problems trying to interpolate some topographic point data from the coast of Japan. The data consist on regular separated points 10 meter apart. I've tried to interpolate ...
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0 answers
153 views

How to interpret values of elevation standard deviation statistic (and not elevation mean) from DEM

I am trying to interpret the standard deviation of elevation to understand the topographic landform of my study area. We have 2km*2km grids in the study area for which we extracted certain landscape ...
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0 answers
290 views

How to add Revit toposolid from GIS KMZ data?

I am new to Revit but I am having trouble importing GIS data (KMZ format) into a toposolid. The KMZ file contains contours, parcel and building footprint information. I have tried several tools and ...
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0 answers
44 views

LS factor in RUSLE model

While calculating LS factor through Moore and Burch (1986) equation LS=(flowaccumulation×Cellsize22.13)0.4×(Sinslope0.0896)1.3 in RUSLE model, what should we use in cell size? Is it in meters or ...
0 votes
1 answer
795 views

How to create simple elevation map

I'm completely new to QGIS, and I would like to know if there is a quick way of creating an elevation map as in the following example. I would like to define 4-5 altitude intervals, and color them ...
1 vote
1 answer
223 views

Estimate solar potential in Python with DEM

I am trying to calculate the solar potential/solar exposure of the littoral zones for a few lakes in Python. I already got the bathymetry/topographic data but I am still searching for ways to ...
2 votes
2 answers
1k views

What would a simple hillshade algorithm be?

I'm curious how GIS systems actually generate a hill-shade from input data like a raster DEM layer. I'd like to implement my own in software (mostly for fun/learning) but I want to start with a ...
1 vote
1 answer
118 views

Tiling Historic Maps using ArcMap

I'm using ArcMap 10.2 on a Windows platform. I have georeferenced about a dozen USGS topographic raster maps from around 1900. Each georeferenced map is an now an .mxd file. To the best of my ...
6 votes
5 answers
11k views

Adding UTM labels to grid in QGIS

I am trying to use QGIS to create a custom topographic map for outdoor use: UTM, 1:50000. What these maps usually have is a 1km x 1km grid, which at the bottom is labeled with a shorthand for the ...
9 votes
3 answers
3k views

What are common methods for converting raster digital elevation data to vector contours?

In researching this I have found many references to the opposite, creating elevation data from contours, but nothing regarding contour creation. Preferably, I am looking for open source solutions like ...
2 votes
0 answers
35 views

Merging overlapping features into one file with attributes (PostGIS)

I am working with os topography files which are split into points, lines and polygons. At the moment, I am trying to merge the separate files into a single topography file. Using this source (Using ...
1 vote
0 answers
286 views

Are the Sentinel-2 images in Google Earth Engine already topographically corrected?

I'd like to know if the Sentinel-2 Level-2A imagery, hosted in Google Earth Engine, was processed to attenuate topographic effects. The dataset description page (https://developers.google.com/earth-...
1 vote
1 answer
780 views

Topographic Correction Method for a Single Image SCS+C

I am trying to code the SCS+C topographic correction method for a single image and a I get this error: "Image (Error) Image.constant: Parameter 'value' is required." I have seen a similar ...
0 votes
0 answers
592 views

Adding z dimensions to a Polygon

I have a polygon (vector file) which has a base z location from a raster file, however it is still a flat shape. Is there a way I could add a z dimension to this vector file so it covers a 3-...
1 vote
0 answers
26 views

USGS Multiple Dates listed and I want to know what they mean

I want to take a look at a piece of land over time and evaluate the change in topography over time. I am using USGS to download some data and I realized they give you a list of dates that correspond ...
2 votes
1 answer
231 views

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 ...
5 votes
3 answers
3k views

Generate Height Above the Nearest Drainage (HAND) using QGIS

I have a DEM I want to generate a HAND for and want to do so in QGIS. Does anyone know of any plugins or the processing steps to be able to do this?
1 vote
3 answers
849 views

Is there a public CanTopo Web Map Tile Service (WMS / WMTS) available?

Does anyone know of a public CanTopo WMS / WMTS available anywhere? I'm assuming CanTopo is more modern / up-to-date than Toporama? Alternatively, what would be your suggestions for the most pain ...
7 votes
1 answer
378 views

QGIS Print Layout doesn't show elevation labels

I'm trying to export a topographic map with elevation labels, but the Print Layout on QGIS is not showing the labels, only the lines. Why??? EDIT: I thought that was clear enough, but here are some ...
11 votes
2 answers
3k views

Fistance when viewing scaled-topographic map

A close friend from my company asked me a question about a topographic scaled map (1:25.000): What was the altitude to a location in km (as you are viewing Earth from space) when he was viewing the ...
4 votes
2 answers
5k views

Seeking European Mountains Shapefile

I am trying to locate a GIS freely downloadable shapefile (preferably polygon) of European main mountain chains (not an elevation data), eg Alps, Carpathian Mountains. I tried variuos sources , ...
1 vote
1 answer
2k views

Adding elevation point data and lines to topography plot using ggplot2

I have pieced together some code to make a topography plot using elevation data and ggplot2. However, now I would like to overlay onto this plot the country outlines, along with points to show the ...
1 vote
0 answers
24 views

Choosing Window Operator for 1-D Elevation Data

Have an interesting theoretical question here: Say you have a swath of elevation data that is essentially a line of densely spaced points. The data is noisy, so a simple median filter is something I ...
2 votes
0 answers
337 views

Interpreting Ruggedness Index calculated from SRTM Tiles

I am looking for help interpreting the values from Ruggedness Index calculations. I downloaded SRTM tiles using the SRTM Downloader plugin in QGIS. Then I calculated ruggedness from SRTM tiles in QGIS ...
0 votes
1 answer
32 views

Identifiying the levels for streams derived from DEM

I am using GRASS GIS and I have been able to identify the various water-flow channels / streams using the documentation from r.watershed. Now I wish to identify the levels of the streams. For example, ...
1 vote
1 answer
485 views

Raster not showing on Orthographic projection when zooming out

I am trying to put together Topographic .Tif rasters (from GMTED data) on an ortographic globe on Qgis 3.4.1, for exemple these 8 layers: However when I change the projection and one of the various ...
2 votes
1 answer
2k views

GeoTIFF height map banding/terracing

I'm getting pretty bad banding, terracing, low resolution appearance when importing height maps to QGIS. I've searched the forums and haven't found a solution to this. Attached are the original USGS (...
0 votes
1 answer
324 views

I want to create my own topographic map [closed]

I need to create topographic maps for scales between 1:100,000 and 1:500,000. This is due to the fact that the official topographic maps in my country are offered in 5k, 10k, 25k, 50k, 100k and 500k. ...
1 vote
1 answer
291 views

Reproducing terrain ruggedness index from the original paper example [closed]

I am not able to reproduce the terrain ruggedness index for the example used in the original Riley et. al paper. The example is as follows: When I try to reproduce the numbers in MS Excel I get ...
0 votes
1 answer
4k views

Find the GPS coordinates where two boundary lines intersect

I have a detailed topo map for an irregular shaped property. It has boundary lines expressed like this, for example; S76˚45'08"W and S59˚38'24"W. The map also notes how long each boundary line is. I ...
2 votes
1 answer
2k views

Where to find topographic basemap with no labels

I am new to QGIS and trying to find a simple topographical basemap for Britain and Ireland. It is a map of prehistoric sites, so I can't have any cities/streets/labels, just topography.
2 votes
1 answer
616 views

Seeking data source for worldwide cross-sections of topographic and bathymetric for woodworking art project

I am a decent R programmer and statistician, I am able to work with data sets pretty well. I am less familiar with GIS tools, but if given a shapefile I can certainly plot political borders and ...
2 votes
0 answers
60 views

Georeferencing historic airphotos along constantly-moving section of San Andreas fault?

I'm a geology graduate student working on a master's thesis project in which I'm measuring creep (movement) over time along a section of the San Andreas fault (in California, USA) using SfM derived ...
1 vote
0 answers
301 views

Why does no line appear when using Interpolate Line in ArcMap? [closed]

I'm attempting to make an elevation profile from a DEM in ArcMap using the Interpolate Line tool. I've done this before, and it has worked great--basically I just draw a line with Interpolate Line, ...
2 votes
1 answer
733 views

Create a topography map base in QGIS

I am building an interactive web bike map and I would like three baselayers. Currently, I have an OpenStreetMap layer and I would like to add a topography layer. I am aiming for something shown on ...
13 votes
5 answers
15k views

Gdal: how to get the max and min altitudes of my topographic raster?

Given a .tiff topographic raster image. How to get the altitudes of the highest and lowest point/pixel ?
-1 votes
3 answers
117 views

Elevation profile of earth [closed]

Where can I find elevation data for the entire earth so that for a given location (coordinate) on the earth, I can find out the elevation of that particular location? In particular, I am curious, what ...
4 votes
2 answers
1k views

Software for amateur topographic surveys

I'm interested in doing rough topographic surveys using my tripod-mounted Brunton transit compass for azimuth readings and laser rangefinder (and maybe an optical level), so obviously going to be much ...
1 vote
1 answer
784 views

Topography - represent result in WKT as polygons with rings or multipolygon without rings?

I'm new to GIS vector, especially for GIS tools like ArcGIS, QGIS,... My question is, for this image below with poylgon 1 and polygon 2, typically how a WKT (Well-known text) is represented in GIS ...
1 vote
0 answers
78 views

Location of island "Trinidad"? [closed]

I was reading a travel diary of an ancestor of mine who describes a cruise from Hamburg to Natal (South Africa) in 1860. At one point a rock island named Trinidad (supposedly only inhabited by animals)...

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