# encgrid

**Repository Path**: buxt/encgrid

## Basic Information

- **Project Name**: encgrid
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-07-23
- **Last Updated**: 2020-12-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# encgrid
A tool to convert an Electronic Nautical Chart into a raster depth map based on Sam Reed's Master's Thesis. 

Requires BOOST and GDAL

To make encgrid:

    git clone https://github.com/valschmidt/encgrid.git
    cd encgrid
    mkdir build
    cd build
    cmake ../
    make
  
To run encgrid:
  
    ./encgrid -h
    USAGE: encgrid -f ENC_FILENAME -b buffer -r resolution
    
To download ENCs on which to run encgrid, goto:
https://www.charts.noaa.gov/ENCs/ENCs.shtml

Example:

    ../build/encgrid/encgrid -f ENC-ROOT/US5NH02M/US5NH02M.000 -b1 -r5
    ENCFilename: ENC-ROOT/US5NH02M/US5NH02M.000
    Buffer     : 1
    Resolution : 5
    ENC-ROOT/US5NH02M/US5NH02M.000
    ./US5NH02M
    Success
    Before
    afterFLODOC is not in the ENC!
    Rasterizing polygon.tiff
    gdal_rasterize -a_nodata -1000 -at -a Depth -tr 5.000000 5.000000 -a_srs EPSG:2219 -ot Int32 -te 356176.352170 4757784.925223 372756.352170 4783834.925223 ./US5NH02M/polygon.shp ./US5NH02M/polygon.tiff
    0...10...20...30...40...50...60...70...80...90...100 - done.
    Rasterizing depth_area.tiff
    gdal_rasterize -a_nodata -1000 -at -a Depth -tr 5.000000 5.000000 -a_srs EPSG:2219 -ot Int32 -te 356176.352170 4757784.925223 372756.352170 4783834.925223 ./US5NH02M/depth.shp ./US5NH02M/depth_area.tiff
    0...10...20...30...40...50...60...70...80...90...100 - done.
    Rasterizing outline.tiff
    gdal_rasterize -a_nodata -1000 -at -a Inside_ENC -tr 5.000000 5.000000 -a_srs EPSG:2219 -ot Int32 -te 356176.352170 4757784.925223 372756.352170 4783834.925223 ./US5NH02M/outline.shp ./US5NH02M/outline.tiff
    0...10...20...30...40...50...60...70...80...90...100 - done.
    Rasterizing point.tiff
    gdal_rasterize -a_nodata -1000 -at -a Depth -tr 5.000000 5.000000 -a_srs EPSG:2219 -ot Int32 -te 356176.352170 4757784.925223 372756.352170 4783834.925223 ./US5NH02M/point.shp ./US5NH02M/point.tiff
    0...10...20...30...40...50...60...70...80...90...100 - done.
    rasterize
    Chart Scale: 20000
    Starting to grid data
	Data points: 419435, Grid: 5210x3316 419435
    Gridded
    Elapsed Time: 7.44964 seconds.

Results are created in a directory having the same name as the ENC file converted. The final result is <filename>.tiff, although other intermediate files are automatically created for troubleshooting and further inspection.:

    US5NH02M/
    ├── depth_area.tiff
    ├── depth.dbf
    ├── depth.shp
    ├── depth.shx
    ├── outline.dbf
    ├── outline.shp
    ├── outline.shx
    ├── outline.tiff
    ├── point.dbf
    ├── point.shp
    ├── point.shx
    ├── point.tiff
    ├── polygon.dbf
    ├── polygon.shp
    ├── polygon.shx
    ├── polygon.tiff
    ├── US5NH02M_raw.tiff
    └── US5NH02M.tiff