Questions tagged [bathymetry]

Bathymetry is the study of underwater depths

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Changing depth colorscale showing the intervals instead of only the minimum and maximum in print layout

I have made a legend with the bathymetry color scale in it example: It only shows 0 and -30 while I have made the color scale using 10 meter intervals, so 0, -10, -20, -30. Does anyone know how to ...
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QGIS Apply Correction to Elevation Datum

I am wanting to apply a blanket correction to a bathymetry layer i.e. add 2m to every DEM cell. I assume I do this in the Raster Calculator but I'm unsure of the command line to use.
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QGIS Merge two DEMs of different resolution

In QGIS I am trying to merge 2 DEMs of different resolutions where there is a slight overlap between the two i.e. merging a bathymetry DEM with a topo DEM across a shoreline. As it is of a higher ...
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In QGIS change DEM elevations values from positive to negative

I have a DEM that currently has positive elevation values for bathymetry and negative values for those above sea level. How can I convert these cell values to negative for bathymetry and positive for ...
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Drawing contour lines of Coastal bathymetry [closed]

I am a novice ArcMap 10.4.1 user. I made a figure of the sites that I sampled in the waters around the Korean peninsula. The base-map is NASA's ocean color .nc image with units of chlorophyll mg-m3 ...
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Depth contour line using bathymetry

I am a very basic ArcMap user.loaded an ocean color .nc map in ArcMap, (the units of the map are surface phytoplankton chlorophyll mg m-3) on which i overlaid graduated symbols of some of my data. The ...
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Water depths map layer

Is there any water depths map layer available? I would like to have something like this: I have tried satellite, but this is not so great to see depths: var satelliteLayer = new ol.layer.Tile({ ...
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How to combine a topographic DEM with an overlapping bathymetry

In QGIS, I had a larger DEM that captured the lake surface and a smaller DEM of the lake bathymetry. I spent a while trying to figure out smart ways to combine the two so as to replace the DEM lake ...
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Extract concontours from S57 features stored in SQLite3 file

I have a table where one of the columns is a set of S57 objects given as a data buffer (FEATURE field): OBJ_ID CHART_FID FEATURE 0 441153270841366 102714 [, M, _, C, O, V, R, *, ,...
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Calculating water depth from ASCII file in QGIS

I downloaded ESRI ASCII file for bathymetry from GEBCO. Now I loaded the file as raster, then I clip the raster file according to my vector images (Image 1), then I did symbology, where I did single ...
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Getting data from Navionics or Genesis Maps(C-map)

Is there a way to import either vectors or at least map tiles I can trace from Navionics or C-MAP Genesis. I have QGIS and ArcGIS Pro, as well as Global Mapper available to me. Genesis does offer ...
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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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2 votes
1 answer
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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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1 answer
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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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How in QGIS to place the signature of the latitude and longitude of the map corner in the layout?

It must be done as in the example.
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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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1 answer
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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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3 votes
2 answers
52 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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1 answer
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TIN interpolation out of extent [closed]

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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491 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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1 answer
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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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304 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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1 vote
1 answer
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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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2 votes
1 answer
230 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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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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1 answer
72 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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1 answer
78 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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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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1 vote
1 answer
1k 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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2 votes
1 answer
259 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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1 answer
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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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1 vote
0 answers
64 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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1 vote
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156 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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1 answer
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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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4 votes
1 answer
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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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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1 answer
971 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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2 votes
0 answers
201 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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1 answer
489 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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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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2 answers
661 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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4 votes
2 answers
234 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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-1 votes
1 answer
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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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6 votes
1 answer
2k 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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1 vote
1 answer
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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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1 vote
1 answer
151 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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