Grid+

Everything a grid needs, in one place

Grid+ combines multiple generation methods, powerful conditioning and optimization, and direct bathymetry interpolation — all with interactive editing and continuous quality feedback. Build, edit, connect, and orthogonalize in one iterative workflow, with the model run always one click away.

N 38°27' W 121°30' GRID+ / CURVILINEAR ORTHOGONAL I × J

DOMAINACTIVE cells0 ortho dev0.24

Build

Complex grids, fast

Generate Cartesian, radial, or curvilinear orthogonal grids straight from georeferenced data, and iterate freely on resolution, IJ orientation, and orthogonality — every experiment backed by robust undo/redo.

• Cartesian, radial/polar & curvilinear orthogonal grids
• Schwarz-Christoffel conformal mapping & spline generation
• Adaptive spacing that concentrates resolution where it matters
• Live online background maps & an extensive shortcut-key library

Edit

Refine without starting over

Import an existing EFDC+ grid, keep its I,J map intact, and shape it in place — move nodes and blocks, smooth, refine, coarsen, and fit the domain to real land boundaries.

• Move nodes and grid blocks by point, line, or area
• Line-based, block-based & Laplacian smoothing
• Refine with splines or coarsen by I/J factors
• Mirror regions, and attract or repel grid lines

Two separate grids loaded and connected into one unified grid

Connect

Assemble grids modularly

When a domain is too intricate for one grid, build sub-grids and stitch them into a single unified grid — save each piece, then show, hide, split, and reassemble as the model demands.

• Join multiple grids together with overlap handling
• Build, save & manage modular sub-grids as files
• Split existing grids to refine, then reassemble
• Purpose-built for complex river networks

One-click global orthogonalization in Grid+

Orthogonalize

Grid quality, automated

Minimize orthogonal deviation across the whole domain or within targeted sub-regions, with fine control over the optimization and continuous feedback on grid quality.

• One-click global optimization
• Configurable outer, boundary & inner iterations plus smoothing factor
• Local refinement of problem areas
• Fewer numerical errors, better results

Examples from the world's hardest domains

From braided tropical rivers to engineered coastlines, Grid+ handles geometry that stops other tools cold.

Amazon River

Riverine

Braided, multi-channel geometry captured in one continuous grid.

Sacramento–San Joaquin Delta

Delta

A vast network of branching channels resolved in one unified grid.

Kodiak Airport Expansion

Coastal

High-resolution coastal grid for an engineered nearshore project.

From skewed to solved, in one operation

Poor orthogonality quietly corrupts your results. Grid+ fixes it across the whole domain with a single click — no manual node-nudging.

Live in Grid+ — one-click global orthogonalization.

One real pass — average orthogonal deviation

Before 7.43

→

After 0.25

−97% average deviation

A closer look at the toolset

Under the intuitive interface is a complete, professional grid-generation engine.

Build and run in a single environment

Grid+ is fully integrated into EEMS. Launch it from Tools → Edit Grid with Grid+ inside EFDC+ Explorer and generate model input files in the same interface — grid to simulation with no exporting, converting, or tool-switching.

• Launches from EFDC+ Explorer — Open Grid+ from the Tools menu and write model input files without leaving the workspace.
• Live online maps — Dynamic background maps with lat/long, multiple sources, and Google Earth imagery — cutting setup time from the first click.
• Online bathymetry — Pull bathymetric data straight into your domain, so depth is built into the grid rather than bolted on later.

Bring grids in. Send grids out.

Grid+ speaks the formats your projects already use — import legacy grids, overlay third-party files, and export to EFDC+ and beyond.

Available as a standalone grid generator, or fully embedded in the EFDC+ Explorer Modeling System.