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https://github.com/airbusgeo/godal
golang wrapper for github.com/OSGEO/gdal
https://github.com/airbusgeo/godal
Last synced: 14 days ago
JSON representation
golang wrapper for github.com/OSGEO/gdal
- Host: GitHub
- URL: https://github.com/airbusgeo/godal
- Owner: airbusgeo
- License: apache-2.0
- Created: 2021-02-05T17:27:05.000Z (almost 4 years ago)
- Default Branch: main
- Last Pushed: 2024-09-12T15:42:02.000Z (about 2 months ago)
- Last Synced: 2024-09-13T15:42:07.288Z (about 2 months ago)
- Language: Go
- Homepage:
- Size: 564 KB
- Stars: 128
- Watchers: 5
- Forks: 25
- Open Issues: 9
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
Awesome Lists containing this project
- awesome-go - godal - Go wrapper for GDAL. (Geographic / Search and Analytic Databases)
- awesome-go-extra - godal - 02-05T17:27:05Z|2022-07-06T12:13:23Z| (Geographic / Advanced Console UIs)
README
# Golang bindings for GDAL
[](https://pkg.go.dev/github.com/airbusgeo/godal)
[](https://github.com/airbusgeo/godal/blob/main/LICENSE)
[](https://github.com/airbusgeo/godal/actions?query=workflow%3Agodal+event%3Apush+branch%3Amain)
[](https://coveralls.io/github/airbusgeo/godal?branch=main)
[](https://goreportcard.com/report/github.com/airbusgeo/godal)
### Goals
Godal aims at providing an idiomatic go wrapper around the 
[GDAL](https://gdal.org) library:
* Function calls return a result and an error. The result will be valid if
no error was returned. The error message will contain the root cause of why
the error happened.
* Calls between go and native libraries incur some overhead. As such godal does
not strictly expose GDAL's API, but groups often-used calls in a single cgo function
to reduce this overhead. For example, C code like
```c++
hDS = GDALOpen(filename, GA_Readonly)
if (hDS == NULL) exit(1);
int sx = GDALGetRasterXSize(hDS);
int sy = GDALGetRasterYSize(hDS);
int nBands = GDALGetRasterCount(hDS);
printf("dataset size: %dx%dx%d\n",sx,sy,nBands);
for (int i=1; i<=nBands; i++) {
hBand = GDALGetRasterBand(hDS,i);
int ovrCount = GDALGetOverviewCount(hBand)
for(int o=0; o<=ovrCount; o++) {
GDALRasterBandH oBand = GDALGetOverview(hBand,o);
int osx = GDALGetRasterBandXSize(oBand);
int osy = GDALGetRasterBandYSize(oBand);
printf("overview %d size: %dx%d\n",o,osx,osy);
}
}
```
will be written as
```go
hDS,err := godal.Open(filename)
if err!=nil {
panic(err)
}
structure := hDS.Structure()
fmt.Printf("dataset size: %dx%dx%d\n", structure.SizeX,structure.SizeY,structure.NBands)
for _,band := range hDS.Bands() {
for o,ovr := range band.Overviews() {
bstruct := ovr.Structure()
fmt.Printf("overview %d size: %dx%d\n",o,bstruct.SizeX,bstruct.SizeY)
}
}
```
* Unfrequently used or non-default parameters are passed as options:
```go
ds,err := godal.Open(filename) //read-only
ds,err := godal.Open(filename, Update()) //read-write
```
* Godal exposes a VSI handler that can easily allow you to expose an
[io.ReaderAt](https://golang.org/pkg/io/#ReaderAt) as a filename that can be
opened by GDAL. A handler for opening `gs://` google cloud storage URIs is
provided through https://github.com/airbusgeo/osio
### Documentation
[](https://pkg.go.dev/github.com/airbusgeo/godal)
contains the API reference and example code to get you started. The
`*_test.go` files can also be used as reference.
### Status
Godal is not feature complete. The raster side is nearing completion and
should remain stable. The vector and spatial-referencing sides are far from
complete, meaning that the API might evolve in backwards incompatible ways
until essential functionality is covered.
### Contributing
Contributions are welcome. Please read the [contribution guidelines](CONTRIBUTING.md)
before submitting fixes or enhancements.
### Installation
Godal requires a GDAL version greater than 3.0. Make sure the GDAL headers
are installed on the system used for compiling go+godal code. If using a GDAL
installation in a non standard location, you can set your `PKG_CONFIG_PATH`
environment variable, e.g. `export PKG_CONFIG_PATH=/opt/include/pkgconfig`.
### Licensing
Godal is licensed under the Apache License, Version 2.0. See
[LICENSE](https://github.com/airbusgeo/godal/blob/main/LICENSE) for the full
license text.