A bathymetric survey grid
Square cells for a survey where the measurement grid itself is square. Squares are the honest choice when the sampling geometry is square; hexagons are the honest choice when it is not. The grid should look like the method.
Start an editable copy with this data and your current map styling.
What to look at
- Square cells for a square sampling grid — the grid should mirror the method.
- A depth ramp and thin cell edges preserve the square sampling pattern.
- Cells below a threshold are omitted, leaving unsurveyed areas blank.
Source columns
These fields describe the example data. CSV and Excel use first-row headers; GIS formats store geometry and feature properties. Required geometry depends on the map type.
| Column | Type | Example |
|---|---|---|
| cell | text | D7 |
| depth_m | number | 54.3 |
Rebuild it with your own data
- 1
Get your CSV file ready
The example fields are cell, depth_m. For CSV or Excel, put headers in the first row. GIS files carry geometry and feature properties. Prepare any grid, catchment or route geometry before import.
- 2
Drop it into the studio
MapCrafter detects the geometry, counts the features, and shows the layers it found.
- 3
Style the imported layer
Pick which column drives colour, and which drives size or width where relevant.
- 4
Pick a basemap theme
Blueprint is used here. 15 other basemaps are available, including official OpenFreeMap styles. Switch using Layers & basemap.
- 5
Share or export
Publish a link, embed the map, or export a PNG at print resolution.
Questions about this example
- What file format does this survey grid use?
- This example illustrates CSV data. The live preview uses GeoJSON geometry. MapCrafter reads CSV directly, along with Excel, CSV, KML, KMZ, GPX, GeoJSON, TopoJSON and zipped Shapefile. No conversion step and no desktop software.
- What columns does the source data need?
- The file used here has 2 columns: cell, depth_m. For tabular imports, supply coordinate columns, WKT or GeoJSON geometry, or address columns for an explicit geocoding step. Polygon and line files carry their geometry separately from these attributes.
- Can I use my own data with this map type?
- Yes. Open the studio, drop in your file, and MapCrafter detects the geometry and applies a starting style. Then style the layer and choose which property drives colour, size or width. The studio can render a point heatmap, but grids, routes and catchment polygons must be prepared before import.
- Can I export or share the finished map?
- Each map can be published to a short share link, embedded in another page with an iframe, or exported as a print-resolution PNG. The cleaned-up geometry can also be exported as GeoJSON. All of that is available on the free tier.
- Where does the data in this example come from?
- Cell values generated from a seeded gradient with noise; not real bathymetry.
More heat maps examples
Gallery (314)- CSVBinned density over LondonTen thousand observations would overplot into a solid blob. Binning them into hexagons aggregates first and colours second, which is the only way a reader can see where a dense point dataset actually concentrates.
- CSVTokyo binned densityA dark-theme hexbin over the Kantō plain, with the highest-value cells reaching a pale yellow. On a dark basemap the ramp has to run towards light, because a dark-to-dark ramp has nowhere left to go.
- GeoJSONAgricultural survey binsA wide, sparse region binned at a coarse cell size. Cell size is the single most consequential choice in a binned map: too small and the pattern dissolves into noise, too large and the structure vanishes into a single blob.
Last updated 2026-10-22