Creating a fresh dataset using a 2D array in node-gdal-async

I'm facing a challenge in JavaScript where I need to create a new dataset from a 2D array. Despite my efforts, I can't seem to figure out the necessary steps from the documentation.

It seems that in order to create this new dataset, I must utilize gdal.open in write mode to enable data writing. However, I am struggling to understand how to populate this blank raster with actual data:

const driver = gdal.drivers.get('GTiff');
const xSize = 3;
const ySize = 3;
const bandCount = 1;
const dataType = gdal.GDT_Int32;
const dataset = await gdal.openAsync('output.tif', 'w', driver, xSize, ySize, bandCount, dataType);

Let's assume I have the following 2D array of data:

// retrieved from an hdf5 file
const data = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
];

What is the best approach for updating my dataset with the provided data?

javascripttypescripthdf5gdal

Answer №1

Below is the accurate code snippet:

const xSize = 3;
const ySize = 3;
const bandCount = 1;
const dataType = gdal.GDT_Int32;
const dataset = await gdal.openAsync('output.tif', 'w', 'GTiff', xSize, ySize, bandCount, dataType);

const data = new Int32Array([
    1, 2, 3,
    4, 5, 6,
    7, 8, 9,
]);

const band1 = await dataset.bands.getAsync(1);
await band1.pixels.writeAsync(0, 0, xSize, ySize, data);
await dataset.flushAsync();

Here are some key points to note:

  • This code is fully asynchronous, ensuring no blocking of the event loop;

  • The use of TypedArrays is necessary with gdal. To work with multidimensional arrays, you may consider using ndarray and scijs, or utilize the gdal-async plugin;

  • While there is no closeAsync method, invoking flushAsync ensures that the data is written. The file will be closed by the garbage collector upon object destruction.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Express Session Issue Preventing Ajax Call from Functioning

After testing the /temp route directly in the browser and then through an ajax call to the /test route, I noticed a difference in the session information. When accessed directly, the session retains the data added via the /temp route, but when called throu ...

javascriptnode.jsajaxsessionexpress

Upon employing the setTimeout method, the element with the id "sign-in-block" will have its display style set to "none" after a delay of 1000 milliseconds

I incorporated the setTimeout() function to make the HTML component appear for 1 second upon pageload. However, I would prefer this component not to load at all. Should I set the delay in the setTimeout() function to 0ms? Alternatively, is there another ...

javascript

Why is the table not sorting when I apply filters?

I am encountering an issue where the data filters and table sorting are not working together. When I apply filters, the sorting functionality stops working. The filters work fine independently, but once applied, they interfere with the sorting feature. Any ...

javascriptangulartypescriptsortingfilter

Managing Nested Elements in State in ReactJS

Check out the code snippet below: import React,{useState} from 'react' const iState ={ Name : '', Email :'', Salary :0, Error:{ EName:'*', EEmail:'*', ESalary:'* ...

javascriptreactjsreact-hooks

The POST function is executed twice, with the first attempt resulting in a failed API call, but the second attempt is

I am experiencing issues with my subscribe dialog, as it seems to be running the API call twice. The first time it fails, but on the second attempt, it succeeds and inserts the email into the database. This double run is causing errors in my AJAX function, ...

javascriptajaxnode.jsmailchimp

Integrate JavaScript date into the gulp-rev workflow

I have been encountering an issue while using the gulp-rev plugin to add a revision of my app/html page generated by the Yeomann webapp generator. My workflow involves zipping the app and then adding a revision, but I am having trouble replacing the hash t ...

javascriptnpmgulptask

Integrate functionality to track elapsed hours in stopwatch timer

Struggling to incorporate hours into my JS Stopwatch timer, the math for calculating the hours section is proving difficult. This is what I have so far, but I suspect the issue lies within the h variable. function formatTime(time) { var h = m = s = ...

javascripttimer

Adjusting the background color of a MuiList within a React Material-UI Select component

Looking to customize the background color of the MuiList in a react material-ui Select component without affecting other elements. Specifically targeting the Select element with the name 'first'. Despite setting className and trying different cl ...

javascriptreactjsmaterial-ui

Searching for the top 10 documents with the highest value in a specific field using mongoose

I am working with a mongoose model that includes a field called played_frequency. How can I retrieve the first 10 documents from all those available, based on the highest value in the play frequency? Here is the interface of my model: export interface ITr ...

javascriptnode.jsmongodbexpressmongoose

Struggling to remove the image tag from the jQuery ajax response

My web app is designed to send an ajax post request to a PHP script, which then returns a chunk of HTML data. This HTML includes an image and a table of information. The challenge I'm facing is how to extract the image from the rest of the HTML so tha ...

phpjavascriptjqueryhtmlajax

Establishing the correct data type to be returned from a fetch function in order to align with a specific custom type

My app has two interfaces defined: export interface Job { job_title: string, employer: string, responsibilities: string[] achievements: string[], start_date: string, end_date: string } export interface CreatedJob extends Job { ...

reactjstypescript

What's the best way to create an onclick event for a li element that includes a pseudo-element ::before

I have successfully created a Timeline using HTML and CSS elements. The visual result is as follows: My goal is to enable users to click on the second circle, triggering a color change in the line that connects the first and second circles. This color tra ...

javascriptjqueryhtmlcss

Transition effect does not work properly when using ng-hide

I am currently working on an application that requires a button to be clicked in order to hide or show a specific element. To achieve this functionality, I am using ng-hide in AngularJS, but I am facing an issue where the transition is not working as expe ...

javascriptangularjscss

Typescript's way of mocking fetch for testing purposes

I have a query regarding the following code snippet: import useCountry from './useCountry'; import { renderHook } from '@testing-library/react-hooks'; import { enableFetchMocks } from 'jest-fetch-mock'; enableFetchMocks(); i ...

javascripttypescriptjestjs

I am interested in extracting specific data from the JSON response

I am trying to extract the value of the message parameter under the messages array where the parameter name is equal to documentId (highlighted in bold below). However, the code I have tried so far does not achieve this as needed. dynamic obj = JsonConver ...

javascriptc#arraysjson

Adding hyperlinks to images on a Project Page in Squarespace with the help of JQuery

I'm currently creating a website on Squarespace and facing a challenge with the project pages. While Squarespace allows me to add images with titles and descriptions, I do not have direct access to edit the page. Unfortunately, the platform does not h ...

javascriptjqueryhtmlclasssquarespace

Activate audio when the link is clicked

Recently, I created a compact web application and it's almost complete. However, there is one cool functionality that I am missing. My goal is to have a sound play when the user clicks a link, but after playing, I want the navigation to continue as us ...

phpjavascripthtmlaudiohyperlink

Tips for implementing a cascading dropdown feature in Angular 7 Reactive Formarray: Ensuring saved data loads correctly in the UI form

I recently found a helpful guide on stackoverflow related to creating cascading dropdowns in an Angular reactive FormArray, you can check it out here After following the instructions, I managed to achieve my desired outcome. However, I now face a new chal ...

angulartypescriptangular-reactive-formscascadingdropdownformarray

Preventing page reload in Supabase with NextJS when the website loses focus and regains it

I am working with the structure in _app.js of my Next.js app. // _app.js // import ... import { createBrowserSupabaseClient } from '@supabase/auth-helpers-nextjs' import { SessionContextProvider } from '@supabase/auth-helpers-react' // ...

javascriptreactjsnext.jssupabase

The error message "TypeError [ERR_UNKNOWN_FILE_EXTENSION]: The file extension ".ts" is not recognized for the file located at /Project/src/index

Whenever I run npm run dev, I keep encountering the following error: TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /Project/src/index.ts. Despite having all my settings configured as recommended, Here is a snippet of my package ...

node.jstypescriptexpressnodemonts-node