Geographic Information Systems

Questions tagged [bathymetry]

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Bathymetry is the study of underwater depths

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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
42 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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0answers
28 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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0answers
32 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
55 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 ...
4
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1answer
217 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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0answers
22 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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0answers
57 views

Using spline / IDW interpolation for bathymetric profile of lake bed in ArcGIS Desktop?

I have partial bathymetric / topographic coverage at 1m resolution of a lake bed and shore and am trying to find an appropriate method for 'filling in the gaps'. I have tried using the following in ...
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0answers
18 views

Assessing mapping accuracy of a DEM with different resolutions

I am mapping conical shaped depressions on the seafloor and would like to know at what resolution of the DEM is my mapping accuracy affected by. For example if I have a DEM of 7 metres, what does the ...
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1answer
76 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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0answers
49 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
87 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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0answers
33 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
84 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 ...
4
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1answer
78 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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0answers
48 views

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
140 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
248 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
411 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
54 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
128 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
376 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
56 views

Need some help with a hillshade [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
96 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
56 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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0answers
493 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 ...
4
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1answer
98 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?
4
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3answers
1k 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
63 views

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

How do I render the ocean depth data on GeoServer?
2
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1answer
222 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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0answers
30 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 ...
5
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2answers
315 views

Converting sign for a 32-bit GeoTIFF with an open source tool?

I have a 32-bit GeoTIFF that represents floating point elevation values, and I'd like to change the sign so that the values are negative instead of positive. What is the easiest way to do this using ...
3
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1answer
376 views

Suggestions for Demto3d parameters

I'm trying to model the great lakes bathymetric data for a cnc. I'm using Qgis to handle the conversion The Geotiff was obtained from https://www.ngdc.noaa.gov/mgg/greatlakes/erie.html using the ...
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1answer
144 views

Calculating distance to 200m depth in bathymetric raster layer using ArcGIS Desktop?

I have a bathymetry layer and I would like to be able to calculate the distance to the 200m depth in the bathymetry raster in arcmap 10.2. How would I go about this? I've tried the Euclidian ...
4
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2answers
1k views

How to achieve parallel Kriging in R to speed up the process?

I have tried the gstat package in R to perform bathymetry predictions based on Kriging interpolation methods. However, the process is very time consuming due the large amount of sampling data I'm ...
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1answer
278 views

Raster appears smooth when created but pixelated when opened again

I have a set of xyz points that I want to turn into a raster format for bathymetry. I am using the Topo to Raster (3D analyst) tool and using the depth as the Field and PointElevation as they Type. ...
3
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1answer
318 views

Interpolation problem: Spline with barriers

I want to create a bathymetry map of a gulf using spline with barriers.When the interpolation finished the map in the gulf was created very well but a value is also created around the island. I tried ...
4
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0answers
192 views

Bathymetry Interpolation in QGIS [duplicate]

I'm trying to create an interpolation of xyz data in QGIS. The data has successfully interpolated, but there is some strange striping or banding on the final result that I cannot seem to get rid of. ...
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0answers
257 views

Bathymetry map (DEM) and the reservoir Volume from bathymetry points

Could anyone provide me with a workflow from POINTS --> Bathymetry map (DEM) and Volume calculation in ArcGIS? I would like to create a bathymetry map (DEM) and calculate the volume for a large ...
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1answer
294 views

Where is the Bathymetry toolbox in ArcMap

I can't find the Bathymetry toolbox on my ArcMap 10.4. I went to the customize toolbar but there is no sign of it. I searched in but nothing shows up.
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1answer
2k views

Creating Bathymetry using .DAT file format in ArcGIS Desktop?

I have the bathymetry data in .DAT format and I want to create the bathymetry map in ArcGIS but don't know how to do that. I know how to create DEM from elevation data points but have never used .DAT ...
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1answer
111 views

Finding vertical datum for bathymetry layer?

I was given a layer that shows bathymetry, and I need to list the vertical datum for the it on the map. Is this somewhere in the layer properties? I only see datum. I don't know the source for the ...
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0answers
80 views

How do you find the longitudinal and cross sectional profiles of polygons?

I am currently carrying out a research project involving submarine canyons. The canyons are mapped as polygons and I need to find the longitudinal and cross sectional profiles of the canyons. Each ...
16
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1answer
2k views

Which interpolation technique is suitable for a bathymetry of a small lake?

This is a lake of approximately 13 ha with 81 sampled depth points in about 10 transect lines: Previously in ARCgis with a 50 ha lake and about a 100 depth sampling points, I got decent output with ...
4
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4answers
5k views

Downloading bathymetric data for free?

I always wondered where cartographers get their bathymetric data from to create maps like the Zanzibar map on wikipedia for instance. I could download polygons for the 1000 meter polygons on ...
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1answer
391 views

Finding service URL of WMS for bathymetry data?

I don't seem to find the link to download the bathymetry data from this site. https://www.geoseaportal.de/gdi-bsh-portal/ui
2
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1answer
253 views

How to perform an anisotropic Elliptical Inverse Distance Weighting (EIDW) interpolation in R?

River bathymetry is generally more variable in the transverse than the streamwise direction, so I need to use anisotropic interpolation technique like Elliptical Inverse Distance Weighting (EIDW) (see ...
2
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1answer
89 views

What is NOS Hydrograph sounding data?

How can sounding data be used for bathymetry when depth is positive? I have downloaded DEM (digital elevation model) as shown in the image below but need bathymetry data for H. All I have found for H ...
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1answer
306 views

Interpolating bathymetric data to make a volume estimate

I have 3 m resolution bathymetric data of a lake that I want to use to make a volume estimate of a landslide deposit that is on the lake floor. Basically, I want to interpolate the bathy data to make ...
2
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1answer
151 views

How to display data at diffrent depths in ArcScene

I am looking for a way to display data at different depths in ArcScene. I have a bathymetry layer which displays fine, and I want to overlay oil platforms in 3D over the bathymetry to show where ...

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