Struct NadGridReader 

pub struct NadGridReader<T: Reader> {
    pub key: String,
    /* private fields */
}

NAD Grid Reader

Description

Loads/reads a binary NTv2 file (.gsb)

Implements the FeatureReader trait

It should be noted that a proj4 Transformer usually uses this class internally. But if you want to manually parse a .gsb file, you can use this class directly.

Usage

The methods you have access to:

• NadGridReader::new: Create a new NadGridReader
• NadGridReader::len: Get the length of the feature count
• NadGridReader::is_empty: Check if the reader is empty
• NadGridReader::header: Read the header
• NadGridReader::get_points: Read a subgrid into a Point
• NadGridReader::get_feature: Read a subgrid into a Vector Feature
• NadGridReader::iter: Create an iterator to collect the features
• NadGridReader::par_iter: Create a parallel iterator to collect the features

use gistools::{parsers::{FeatureReader, FileReader}, readers::NadGridReader};
use std::path::PathBuf;

let mut path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
path.push("tests/proj4/fixtures/BETA2007.gsb");

let nadgrid_reader = NadGridReader::new("test".into(), FileReader::from(path.clone()));
let features = nadgrid_reader.iter().collect::<Vec<_>>();
assert_eq!(features.len(), 1);

Links

• https://web.archive.org/web/20140127204822if_/http://www.mgs.gov.on.ca:80/stdprodconsume/groups/content/@mgs/@iandit/documents/resourcelist/stel02_047447.pdf
• http://mimaka.com/help/gs/html/004_NTV2%20Data%20Format.htm

Fields

key: String

The name of the grid

Implementations

impl<T: Reader> NadGridReader<T>

pub fn new(key: String, reader: T) -> Self

Create a new NadGridReader

pub fn len(&self) -> u64

Get the length of the feature count

pub fn is_empty(&self) -> bool

Check if the reader is empty

pub fn header(&self) -> &NadGridHeader

read the header

pub fn get_points(&self, index: u64) -> Option<VectorMultiPoint>

Read a subgrid into a Point

pub fn get_feature(&self, index: u64) -> Option<NadVectorFeature>

Read a subgrid into a Vector Feature

Trait Implementations

impl<T: Clone + Reader> Clone for NadGridReader<T>

fn clone(&self) -> NadGridReader<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug + Reader> Debug for NadGridReader<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T: Reader> FeatureReader<NadMetadata, Map<String, ValueType>, Map<String, ValueType>> for NadGridReader<T>

A feature reader trait with a callback-based approach

type FeatureIterator<'a> = NadGridIterator<'a, T> where T: 'a

The Feature Reader should implement an iterator of some kind

fn iter(&self) -> Self::FeatureIterator<'_>

All readers have an iter function that returns a Iterator struct

fn par_iter( &self, pool_size: usize, thread_id: usize, ) -> Self::FeatureIterator<'_>

All readers have a par_iter function that returns a ParallelIterator struct