Struct grib::Grib2SubmessageDecoder

pub struct Grib2SubmessageDecoder { /* private fields */ }

Decoder for grid point values of GRIB2 submessages.

Examples

use grib::Grib2SubmessageDecoder;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let f =
        std::fs::File::open("testdata/CMC_glb_TMP_ISBL_1_latlon.24x.24_2021051800_P000.grib2")?;
    let f = std::io::BufReader::new(f);
    let grib2 = grib::from_reader(f)?;
    let (_index, first_submessage) = grib2.iter().next().unwrap();

    let decoder = Grib2SubmessageDecoder::from(first_submessage)?;
    let mut decoded = decoder.dispatch()?;
    assert_eq!(decoded.size_hint(), (1126500, Some(1126500)));

    let first_value = decoded.next();
    assert_eq!(first_value.map(|f| f.round()), Some(236.0_f32));

    let last_value = decoded.nth(1126498);
    assert_eq!(last_value.map(|f| f.round()), Some(286.0_f32));

    let next_to_last_value = decoded.next();
    assert_eq!(next_to_last_value, None);
    Ok(())
}

Implementations

impl Grib2SubmessageDecoder

pub fn from<R: Grib2Read>( submessage: SubMessage<'_, R>, ) -> Result<Self, GribError>

Sets up a decoder for grid point values of submessage.

pub fn dispatch( &self, ) -> Result<Grib2DecodedValues<'_, impl Iterator<Item = f32> + '_>, GribError>

Dispatches a decoding process and gets an iterator of decoded values.