# GF-3 SARscape Go Wrapper

This wrapper embeds `assets/gf3_sarscape_cli.sav` and calls the local ENVI/IDL Runtime:

```text
idlrt.exe gf3_sarscape_cli.sav -args input_meta_xml out_dir dem_file HH,HV
```

It is the operational Windows path for SARscape-based GF-3 processing.

## Build

From this directory:

```powershell
$env:GOTELEMETRY = "off"
go build -o ..\..\dist\windows\gf3wrapper.exe .
```

## Run

Single archive:

```powershell
..\..\dist\windows\gf3wrapper.exe `
  -input "D:\GF3\GF3_SCENE.tar.gz" `
  -output "E:\GF3\L2_SARscape" `
  -dem "D:\DEM\COPDEM_GLO30_China_4326_DEM" `
  -pol "HH,HV"
```

Batch directory:

```powershell
..\..\dist\windows\gf3wrapper.exe `
  -input "D:\GF3\L1A_BATCH" `
  -output "E:\GF3\L2_SARscape"
```

If `gf3wrapper.json` exists next to the executable, omitted `-input`, `-output`, `-dem`, and `-pol` values are loaded from that file.

## Notes

- The server still needs ENVI, IDL Runtime, and SARscape installed and licensed.
- `.tar.gz` inputs are extracted under each scene output directory in `.gf3_extract`.
- The embedded SAV is extracted to `<output>\.gf3_runtime\gf3_sarscape_cli.sav`.
- More operational details are in `docs/sarscape_go_wrapper.md`.