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Questions tagged [topography]

45 questions
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How to find the best translation available to match two sets of related points that do not exactly match?

I'm working with lidar data for forestry analysis. I'm trying to match some tree measurements that were taken on the ground. Circle areas were defined, and the center coordinates of those circles were measured using a GPS that was only accurate to…
user19109076
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Finding topographic prominence of peaks in a 2D heightmap

Is there a (preferably simple) algorithm for finding topographic prominence of peaks in a 2D heightmap? I'd like to find how prominent each local maximum is. I'm toying with good old terrain generation and I'd like the generator to identify…
nj16
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interpolated map using points python

I need to obtain a colour map using interpolation of altitude records. I have a set of 34 points located along a region and in each point I have altitude record. I tried the code below, but it results in a map that cannot extrapolate to the State…
bruce_skywalker
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Python: Surface Plot not Representing Data Set Properly

I am currently trying to create a 3D surface plot based on some topographic survey data I took. The data consists of a GPS position based in UTM. I then created a mesh, interpolated using the nearest neighbor method, and plotted the surface using…
James Corn
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Topographic type of map on routeme in iphone?

I have integrated offline maps into my project with the help of route-me sample app (https://github.com/route-me/route-me). But my client wants to show topographical type of map as the open street map. I have searched over the internet, couldn't…
happycoder
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Map 3D point cloud onto surface then flatten

Mapping a point cloud onto a 3D "fabric" then flattening. So I have a scientific dataset consisting of a point cloud in 3D, this point cloud comprises points on a surface that is curved. In order to perform quantitative analysis I however need to…
user1497810
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whitebox:wbt_hillshade Why are values not between 0 and 255 in R?

If you follow the tutorial here: https://vt-hydroinformatics.github.io/rgeoraster.html I want to create a hillshade map. In general hillshade is between 0 and 255 but these values are very high. How do I interpret them? wbt_hillshade(dem =…
Megan
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Calculate Topographic Position Index for coordinates stored in a dataframe in R

I'm trying to calculate Topographic Position Index (TPI) for 177 points of interest. I have their coordinates stored in a data.frame and elevation in a raster of 7.5 arc sec spatial resolution. And the TPIs I'm calculating is basically: the…
idontreallyknowhehe
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MATLAB plotting function to visualise data from different topographic brain maps

I have 300 topographic maps from a neurodevelopment-framework experiment. I would like to plot a topographic map from EEG data which each second would show a different topographic map from the above 300 mentioned, ie, I'd like to make a dynamic plot…
Stephano
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Is there a crate that can read insanely large png files quickly with no data loss. (17mb files with 21600 x 10800)

My rust app needs to have access to world heightmap data (topography) which I have downloaded from nasa's official website. Currently, with me using the Image crate https://lib.rs/crates/image, it takes roughly 1 minute for the entire app to load,…
James Gaunt
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ReactJS mui/material Topography value error

interface CardTableRowInterface { key: string; label?: string; value?: (data: any) => React.ReactElement; children: React.ReactNode; } export interface CardTableProps extends CardTableStyleProps { data: Record; rows:…
Kok How Teh
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How to convert Cartopy tiles in gray scale (2022)

I'm trying to display topography data as a background to put some flooding data I have on top. And I want to display this topography in a certain color scale (gray seems to be popular) to avoid having that color in my color bar for the flooding data…
JumperSnatcher
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How to change background and outline color on topographic map?

I followed this excellent guide by Adam Symington and successfully created the following topographic map of Sabah (a state in Malaysia, which is a Southeast Asian nation). The awkward blob of black in the upper left corner is my attempt to plot…
Thev
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Looking for a way to capture elevation and location data from a device to create a topographical map or model

I'm in the process of buying a 7.5 acre plot of land in a wooded, hilly area. I would estimate that the elevation varies about 50 feet from the bottom of the creek to the top of the hill. I would like to find a good method for measuring the…
JamesA
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Add high-resolution bottom topography to Cartopy map

I'm migrating from basemap to Cartopy and would like to plot ocean bottom topography with high resolution for a limited area. In basemap I was using ETOPO1_Ice_g_gmt4.grd and transforming it to map coordinates based on documentation I had found…
Snj
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