Layers & Files

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Base & Reference

Esri World Boundaries & Places

Esri World Hillshade

Overlays

Source

Drag layers to change draw order (top = above).

Tools

Probe elevations (ETOPO)

Measure tool

Off Distance Area

Distance units

Area units

Tip: Left-click to add points. Right-click / double-click / Esc to finish.

KMZ / KML Tools

Choose KML/KMZ…

Drag & drop files here

KMZ is unzipped client-side; multiple files supported.

Imported Layers

Exports all features in the selected imported layer.

Soundings (ETOPO)

Mode

idle

Single: Click Start then click on the map to place individual soundings using the spacing, units, and styling controls below.

Single Section: Click Start, then click to add vertices and double-click to finish. Soundings are sampled along the section using the spacing below.

Auto-open profile after sampling (for section profiles)

Multi Section: Draw a centerline, generate perpendicular cross sections, then step through their profiles.

idle

Section spacing m Left length m Right length m Auto sample first

0 sections

Grid: Click Start, draw a polygon, and double-click to close. A grid of soundings is sampled inside using the spacing below.

Spacing

Units

Precision
1 decimal 2 decimals

Skip land (MSL ≥ 0)

Rotate

Size

Color by Invert

Domain Min Max Auto

Clamp Emphasize shoals

min mid max

User Soundings (XYZ)

Import a simple XYZ text file of soundings in South Carolina State Plane (NAD83 / ft, EPSG:2273). Coordinates will be reprojected to geographic (lat/lon) and drawn as points on the map.

XYZ file

Actions

Zoom to user soundings when loaded

No file loaded. Expected whitespace- or comma-delimited X Y Z with X/Y in ft.

Raster Overlays (GeoTIFF)

Import GeoTIFF rasters in South Carolina State Plane (EPSG:2273, US-ft). Each file will be added as a map overlay with its own opacity control.

GeoTIFF file(s)

Actions

Loaded raster overlays

No GeoTIFF overlays loaded yet.

Each overlay has its own opacity slider and controls.

Change Detection Toolset

Analyze a difference grid (XYZ) for significant changes around 0. Values may be positive (shoaling) or negative (scour). This tool detects clusters of cells where the absolute change exceeds a user-defined threshold.

Difference grid (XYZ)

Change threshold

ft (|ΔZ| ≥ threshold)

Cluster radius

ft (plan view)

Min cells per object

DBSCAN-like density filter

Actions

Zoom to detected objects after analysis

Summary

No analysis run yet. Load a difference grid and click Analyze.

Top change objects

No objects yet.

Contours (ETOPO)

Draw an area of interest (AOI), choose a grid spacing and contour interval, then generate contour lines from the ETOPO surface.

idle

Sampling ETOPO… idle

Grid spacing m Contour interval m Skip land (MSL ≥ 0)

Color Slight smoothing 0 contours

Note: For performance, AOIs with very fine grid spacing may be rejected. Start with 100–250 m and tighten as needed.

Line Planning Toolset

Build line plans by drawing an AOI and generating parallel lines. Use Depth Aware mode to compute spacing from depth + swath geometry.

Mode

Depth source

Opening swath angle

°

Overlap

%

idle

ready

Rotation

0°

Spacing

50 m

Extension

m (next generate)

Label prefix

Start #

Vessel speed

kt

0 lines

Saved line plans

(none yet)

Volume Calculation Toolset

Compute cut / fill volumes between two surfaces over a shared area. For this version, both surfaces must have matching XYZ sample locations in South Carolina State Plane (US-ft).

Surface A (Existing) – XYZ

Surface B (Design / Template) – XYZ

A = Existing bathymetry, B = Design or comparison surface. Volumes are computed as A − B (positive = cut).

Volume Summary

No calculation run yet. Select Surface A and Surface B, then click Compute Volume.

Vector Overlays (DXF)

Import 2D DXF linework (e.g. channel centerlines, toes) and overlay it on the map. For this version, DXF coordinates can be in South Carolina State Plane (US-ft) or geographic WGS84 (lon/lat).

DXF file

DXF coordinate system

DXF Layers

No DXF layers loaded yet.

Cross Section Toolset

Build a profile along a user-defined section line, sampling an Existing XYZ surface and an optional Design XYZ surface (SC State Plane, US-ft).

Existing surface (XYZ)

Design surface (XYZ, optional)

Station spacing (ft)

Profile

Summary

To generate a cross-section: (1) Select an Existing XYZ surface (and optional Design). (2) Click "Draw Section" and pick two points on the map. (3) Click "Generate Section".

Probe

Location

–

ETOPO

–

Status

idle

Negative values = depth (m).

Section Profile