Questions tagged [bathymetry]

Bathymetry is the study of underwater depths

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Converting Australian Bathymetry and Topography contours to DEM for Blender visualization

Purpose: I want to produce a visualization of the Australian seafloor but I'm not having any luck converting the shapefile contours to a DEM. I can convert landmass DEM into a Blender viz and the next ...
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1answer
24 views

Average depth of linear features in QGIS

I have a shapefile with some linear features that I have drawn on the seafloor with QGIS. How can I calculate the depth of these in the field calculator (or another place)? I am looking for the ...
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Serving supplemental layers from tileserver-gl

Maybe a multi part question, but essentially I have an existing self hosted tileserver-gl instance running to serve tiles to my webserver. I am trying to figure out the best way to display weather ...
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1answer
23 views

Adding a CSV with GPS coordinates points and bathymetry data to Google Earth Engine

I'm trying to construct a bathymetry point map on GEE, and I want to import a CSV that contains bathymetry data. The CSV that I'm about to import to GEE has the following columns: Latitude, Longitude ...
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Problem starting GRASS addon from within R

Problem I've been trying to run the grass addon i.image.bathymetry from within RStudio as it requires several R packages to run. Please note I am not very familiar with using GRASS. However, I keep ...
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63 views

Adding more values to legend on print composer tool of QGIS

I am creating a map with a bathymetry layer (raster) on the print composer tool of QGIS. On the legend it only appears the minimum depth and the maximum depth. Is there a way on QGIS to show more ...
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47 views

What is the right geoid for calculating current sea depth from ECEF position and sea depth soundings

Let's say that I have an ECEF position (derived from GNSS, IMU, and barometric data) which is accurate to +-10cm. Let's also say that I have a chart of sea floor soundings, which, as unrealistic as it ...
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1answer
34 views

TIN interpolation out of extent

I have a problem with the TIN. I just started using QGIS because I no longer have access to ArcGIS. I want to create a reservoir bathymetry map from depth survey points. I created a polyline and ...
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2answers
345 views

Creating bathymetry maps using sonar data in SAGA

I am a geologist, however somewhat of a newbie to GIS. As a personal project, I am looking to create some bathymetric maps of some local fishing lakes. I am looking to do this using free open source ...
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1answer
54 views

My bathymetric sounder only exports to XYZ file want to input into GRASS

The export file has long, lat, elevation in a float format i.e. -70.8838319778442, 42.3222159164251, -14.6 The file is over 18 MB and each lat/long/elev is MOSTLY 1.5 meter apart and sometime maybe up ...
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241 views

Importing .bag (bathymetry) files into QGIS 3.x

I downloaded bathymetric data from the NOAA Bathymetric Data Viewer website: https://maps.ngdc.noaa.gov/viewers/bathymetry/ I've tried to import and view several .bag files from this website within ...
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Converting River Channel Cross-Section Data to Bathymetry

I have multiple surveyed cross-sections of river channels and need to convert this data into 3D polylines (shapefile) for use in a hydraulic model. The cross-section data is typically supplied in &...
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1answer
51 views

Problem with importing NONNA-100 bathymetry data into QGIS

Total QGIS newbie. Tried importing Canadian Hydrographic Service Non-Navigational (NONNA-100) Bathymetric Data found here https://open.canada.ca/data/en/dataset/d3881c4c-650d-4070-bf9b-1e00aabf0a1d ...
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How to remove slope from DEM to better visualise topographic features of vriver systems in QGIS

I have a DEM of a river channel that i would like to remove the overall slope but retain features such as pools, riffles, bars etc. I have used the River Bathymetry Toolkit (detrending tool https://...
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1answer
171 views

Wrapping a GeoTIFF over the antimeridian in QGIS

I want to make a map of marine sampling locations for a study, and in this context show some bathymetric profiles. So in my map I have shapefiles from NaturalEarth as well as GeoTIFF bathymetry data. ...
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1answer
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Creating a greyscale bathymetry map of the world in QGIS

I am looking to create a greyscale bathymetry map of the world in QGIS which I can then output as SVG contour lines. Maybe there is somewhere where I can find and download greyscale vector tiles of ...
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1answer
58 views

Opening multiple text files into a single .tab file in MapInfo

I am trying to open multiple xyz text files into mapinfo to create a table where i can create a raster image of multibeam bathymetry. Is there a script which will open each .txt file and merge them ...
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1answer
69 views

How to count points of a point layer (shp) for each depth class of a bathymetry vector layer

I am using QGIS 2.8.3 but also have 3.4 whatever works better for this issue. I have a bathymetry shapefile and a point layer. One of the columns of the bathymetry vector gives the maximum depth and ...
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79 views

Getting data from Humminbird ChartSelect .bin file [closed]

I purchased some lake bathymetry data from humminbird chartselect. I can see those data using their applications such as FishSmart or also using the humminbird sonar module. But I would like to read ...
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1answer
973 views

Opening Lowrance .at5 files in Mac/Linux/Windows

I have some bathymetry data in Lowrance .at5 format. I would like to read those data to my computer and process it (convert it into point cloud etc). Is there any software available to do so? Or is ...
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1answer
232 views

Mean lower low water (MLLW) for tidal correction

I am estimating water depth (bathymetry) using satellite data over a US water. I have obtained tidal values (datum is MLLW) as at the time of satellite overpass to correct my satellite-derived ...
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1answer
64 views

Integrating sea level curve data in a bathymetric grid

I am attempting to apply these data recording where sea-level was in the Gulf of Mexico (in meters below mean sea level) over the past 20,000 calendar years at a 500-year resolution in ArcMap: What ...
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63 views

Pictures with isobaths to a 3D Model in a Browser

I have pictures of lakes with isobaths (*). The result should be a 3D model in a browser. I tried to make a vector image, but this results in a SVG. I can not import it. How do I make a layer of the ...
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128 views

Combining Bathymetric and Elevation Data using R?

Here is some elevation data of some islands. I wish to add depth info to the water. With the generous help of @Spacedman at Overlaying elevation data and bathymetry data in R? I get: To resolve the ...
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1answer
124 views

Overlaying elevation data and bathymetry data in R?

I have two layers that cover approximately, but not exactly, the same area. One is land elevation of some islands. The other is the depth of the water around the islands. I can resolve the vertical ...
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1answer
1k views

How to Loading BAG file format in QGIS

I need to load a BAG file (Bathymetry attributed grid) in QGIS (3.4) according to the supported file page https://www.gdal.org/formats_list.html it is supported, but is not compiled by default and ...
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32 views

How do I compare multiple years worth of geomorph changes in a river while drawing one profile line?

I have many years worth of DEMs of a river I'm studying. I'm very, very new to ArcGIS (think one intro class), and learned how to use the 3D analyst tool. What I'd like to be able to do, is to draw ...
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1answer
789 views

Reading bathymetry for coordinate with Python? [closed]

I need the water depth at specific coordinates and my geoscientist are offering me a dataset in either TIFF or XYZ/txt format with data points each 2km. I will typically be extracting about 1000000 ...
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183 views

How to correct depth values with tide data? [closed]

We are trying to derive bathymetry using sentinel images using QGis 2.18. The training data is from a boat gps track taken in 2 days. The depth value captured needs to be corrected for tidal ...
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1answer
391 views

How to separate or cut the elevation from bathymetry raster TIFF file with vector layer coastline in QGIS 3.4.3?

I have a raster GeoTIFF file downloaded from GEBCO 2014 which contains bathymetry and elevation. I need to split in 2 layers the raster GeoTIFF file (layer: Bathymetry and layer: Elevation) using ...
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122 views

How can I change the elevation of a lake on a DEM so I show the lake bottom contours?

I'm studying the drainage of a lake and I have a DEM of the lake and the surrounding area. I already identified the shorelines of ancient lake levels at higher elevations, but I would like to keep ...
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2answers
581 views

Getting bathymetric contours confined only within river banks using QGIS?

I have bathymetric survey data in the form of XYZ. X and Y are coordinates while Z is river bed level (elevation) from a datum. These are about 14000 irregularly located points within a river. Now I ...
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2answers
199 views

Measuring distance from gridsquares to contours of a shapefile

I have a baselayer (.shp file), with bathymetric contours. I want to measure the distance from each grid square in a grid, to the nearest nominated depth (so was hoping to have a way to also nomate ...
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Trying to interpolate depth measurements of a pond

We have taken depth measurements across a pond, and have a CSV file with each location's GPS coordinates and depth in meters. We are trying to create a map of this pond showing where the channel is ...
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1answer
290 views

SRTM/DEM 1m resolution (batymetri) to point [closed]

I have bathymetry data (1 huge data) = SRTM/DEM/FGDBRaster (0,9818m resolution pixel, floating, 32 bit, 45 GB size) and an alternative data (split into small pieces data) = same data but with 1m ...
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1answer
1k views

LiDAR returns over water bodies?

I have obtained LiDAR data from my environmental agency in order to obtain the relative heights of each watercourse station. A far as I know, LiDAR signals do not get returned over water bodies. ...
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1answer
2k views

XYZ bathymetry to Raster?

I have some XYZ bathymetry data in an irregular, non north-up pattern -- i.e. not gridded. It is saved as a CSV file. 443564.526,6636541.778,-105.47 443564.526,6636538.778,-105.44 443567.526,6636544....
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1answer
127 views

Applying single symbology definition to multiple TIFFs in ArcMap?

I have 143 separate TIFF files representing bathymetric data, all with different data ranges (high/low values). I want to create and apply a single symbology file having 6 levels corresponding to 6 ...
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1answer
161 views

Automatically detecting relief in flat areas from hillshape for marine bathymetry using ArcGIS Desktop?

I am trying to identify areas of interest in the ocean around 30-150 m that have some "topographic relief" compared to their surrounding areas. I did this manually by looking at the hillshade and ...
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1answer
783 views

Data for depth contours/DEM for Mediterranean sea

I am searching for data for depth contours for the Mediterranean sea, especially the Aegean sea in any format (raster, shp). Does anyone know if there are any free available data?
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0answers
76 views

Low quality when applying hillshade on specific DEM [duplicate]

I've been using GIS for a dissertation project and am having a little trouble with using a hillshade on a specific DEM. My project is looking at Cyprus, and as such I've looked around and found a ...
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0answers
116 views

Interpolating sparse bathymetry to correct global grid using ArcGIS Desktop?

I am using ArcMap 10.5.1 I am trying to update a global bathymetry grid (at 1 min resolution) with local sounding data (resampled to 1 min resolution). The sounding data is sparse and irregular in ...
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0answers
78 views

Getting bathymetric slope data on ArcGIS Desktop from ASCII file? [closed]

I have a project in which I have to project XYZ ASCII file data to get a DEM. It's my first maritime map, any ideas which tools should I use? I have already tried the Spatial Analyst Tools and haven'...
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2k views

How to view Navionics bathymetry Web API in QGIS?

I am looking to view a Navionics bathymetry map in QGIS. The maps can viewed in a browser on the Navionics website here: https://webapp.navionics.com/?lang=en#boating@6&key=%7B%7DoiGbyvcN Is it ...
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1answer
123 views

Do DTMs record depth of lakes?

Is it possible to extract the depth of an inland lake from a DTM or DSM? Is it recorded or just the surface elevation of the water?
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4answers
2k views

bathymetry (Ocean Floor depth) data - API or similar

I am looking to extract the ocean floor depth from a given lat/lng. Research has lead me to lots of sources. Does anyone have any words of wisdom or good sources or the best way to achieve this? ...
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1answer
106 views

Rendering bathymetry data in .cdf format on GeoServer? [closed]

How do I render the ocean depth data on GeoServer?
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1answer
363 views

GRASS GIS: Interpolate DEM from irregularly spaced coastal survey data

I am attempting to interpolate the elevations of data sets of cross-shore survey transects. The data set size range from 50k to 300k points with ~100m between the transects and 1-5m between the points ...
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43 views

Dynamically coloring a terrain surface based on extent/visible elevation

This application is being developed using ArcGIS JS. I have a 3d rendered terrain surface of the ocean floor. I've created a raster file to represent this 3d surface, created a tile-cache from said ...