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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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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, ...
djebbouri mohammed's user avatar
2 votes
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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 ...
The Great One's user avatar
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 ...
Wilcar's user avatar
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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 ...
orlando's user avatar
1 vote
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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 ...
GeronimoP's user avatar
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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 ...
RashmiSRana's user avatar
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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 ...
John R's user avatar
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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 ...
Diksha's user avatar
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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 ...
user3685604's user avatar
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 ...
b_robran's user avatar
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2 answers
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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 ...
schobbe's user avatar
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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 ...
Nick's user avatar
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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 ...
Kathryn Adams's user avatar
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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 ...
Fredrik's user avatar
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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-...
Erli Pinto's user avatar
1 vote
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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 ...
Sara's user avatar
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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-...
James the Flooded Roads Guy's user avatar
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 ...
DarkTrick's user avatar
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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 ...
David Martins's user avatar
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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 ...
Claudio Hernández's user avatar
1 vote
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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 ...
jameshgrn's user avatar
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 ...
Dinosaur Reporter's user avatar
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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, ...
Indian's user avatar
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2 votes
1 answer
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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 (...
Pledwards's user avatar
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 ...
Omar Shehab's user avatar
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.
acasaly's user avatar
  • 83
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 ...
Nick Roberts's user avatar
2 votes
1 answer
732 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 ...
KLee's user avatar
  • 61
-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 ...
Sascha's user avatar
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1 vote
1 answer
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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 ...
Bằng Rikimaru's user avatar
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 ...
Miguel Cuevas's user avatar
1 vote
1 answer
151 views

Summarizing flatness of county with statistic Elevation variance per square mile

I need to classify every county in the US as either hilly, moderately hilly, or flat. Accuracy is not critical, just a rough classification. I used R and followed the advice in this answer to import ...
Ben Hendel's user avatar
0 votes
1 answer
68 views

How could I classify every county in this US as flat, hilly, or moderate? [duplicate]

I'm looking for a VERY rough label for every county, so low-res data is fine here. Is there data on existing elevation change per county? Or should I get an elevation layer of the US and do a zonal ...
Ben Hendel's user avatar
1 vote
0 answers
235 views

How do we georeference a toposheet using GCS or PCS?

I am new to the GIS domain. I need to georeference a toposheet, Datum - WGS84, 1:50,000 scale map. I have done the georeferencing using WGS for GCP's and then projected to WGS_94_UTM Zone 43N, using ...
Aavani Priya's user avatar
2 votes
0 answers
1k views

How is Topographic Position Index calculated?

My understanding of how topographic position index is calculated is: TPI = cell value - (mean of cell values within defined neighborhood) But, I see that Weiss' original poster (http://www.jennessent....
nateroe's user avatar
  • 253
1 vote
0 answers
120 views

Sentinel-2 topographic artifacts: How to fix?

I'm working with Sentinel-2 (Level2A) false color composite images. A few of them present artifacts in alpine terrain. See highlighted area on the image below, in the Swiss Alps. These artifacts are ...
SaskiaG's user avatar
  • 429
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 ...
TheKutKu's user avatar
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 ...
RJF's user avatar
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4 votes
2 answers
631 views

How do I assign a height to each individual contour line using QGIS. Raster > Extraction > Contour

What I'm essentially asking is, is there a way to, when making contour lines using extraction in QGIS, assign heights to each line? For example instead of 1000, 2000, 4000, 6000 etc. etc. you have 500,...
user161329's user avatar
2 votes
1 answer
1k views

Getting from a USGS historical topographic map to a Unity terrain heightmap

Is it possible to start from a USGS historical topographic map and get to a Unity terrain heightmap? To see an example of the kind of historical topo map I am talking about: Go to: https://ngmdb....
eggroll's user avatar
  • 123
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, ...
user150886's user avatar
2 votes
0 answers
74 views

Landsat L1GS product processing to change detection analysis ready state

At high latitude area of Svalbard Norway, one can find Landsat 8 data processed to L1TP level. With previous Landsat missions, this is not the case. Landsat 7 data are processed to L1Gt level and ...
Mitro Müller's user avatar
0 votes
0 answers
167 views

How to convert DHHN2016 to mean sea level?

I am new to GIS. How can I convert DHHN2016 to mean sea level? I am using this dataset https://www.opengeodata.nrw.de/produkte/geobasis/hm/dgm1_xyz/dgm1_05314000_Bonn_EPSG4647_XYZ.zip which I stiched ...
sehan2's user avatar
  • 457
4 votes
1 answer
659 views

What happened to buildings on USGS topo maps?

I have been using the National Map website to download some topographic maps and I can't help noticing a big difference between the old and new. Historical USGS topographic maps have building outlines ...
Anger Density's user avatar
0 votes
0 answers
21 views

Analyzing Sonoma County's topography/slope in 2017 fires

I am looking to create a map of sonoma county's topography. I am looking at one of the components of a fire: slope. I want to first isolate sonoma county, which is easy enough to do, after that ...
maryjanesmymain's user avatar
3 votes
0 answers
624 views

Effectively applying cpt-city colour ramps to elevation in QGIS3

There are lots of nice topography and bathymetry colour ramps provided by cpt-city in QGIS. However, I cannot find a straightforward way of specifying the transition from blue (below sea level) to ...
B_Dabbler's user avatar
  • 441
0 votes
0 answers
219 views

Creating seamless/uniform topography with multiple raster tiles?

I have multiple elevation raster tiles of an archaeological site and it would be extremely useful for me to visualize the topography as one 'uniform' image/layer. I have attempted to merge the rasters,...
LCorvino's user avatar
1 vote
0 answers
119 views

Expand features in shapefile

I have a shapefile with 634k features that when I open in QGIS is filtered to 6 squares. How can I expand it to get all the points, I need to make a topo map from it.
Josh's user avatar
  • 11
1 vote
0 answers
35 views

Analysing local features on rasters using ArcGIS Pro?

I have several raster datasets representing the elevation on a beach (See Picture). The beach topography include beach cusps (which represent local max on the beach). I want to extract some ...
SiegmundNuyts's user avatar
1 vote
0 answers
327 views

How to make a topographic map with a Digital Terrain Model shapefile?

I'm 2 weeks in self-learning QGIS so I don't know if my question is the same with the suggested similar ones. I'm making a map like this. A map of a mountain with a "mountain-like" texture. By u/...
BallpenMan's user avatar
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