[GIS] Read GeoTIFF file with php or javascript

geotiff-tiffjavascriptMySQLPHP

Sorry, I am newbie with GeoTIFF files.
I want to create a project that a person can upload a GeoTIFF file and the web application saves the lat/long of the picture into the database, the server side programming based on php and the database is MySQL.

Is there a library or a way to read and extract information of a GeoTIFF picture with php or javascript?

Best Answer

there is a php extension called php-gdal

I found some install instructions: https://www.drupal.org/node/2133103

the main site: https://github.com/geonef/php5-gdal

helpful? http://dl.maptools.org/dl/php_ogr/php_ogr_documentation.html

I looked at scruss' suggestion: ( How to read GeoTIFF using PHP? ) and downloaded the code to take a look at. I'm not convinced it is what you need. Close, but I think you'll find yourself stripping most of the code away and possible need to add some of your own. Best to try and find something pre-made. Hopefully the php-gdal will work for you. I have not tried it but use gdal in python regularly and it is great.

Be sure to let us know how it goes.

another possibility: http://www.invet.net/images/catalog/creating_maps.pdf

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[GIS] How to read GeoTIFF using PHP

Download the source code from here

http://www.osola.org.uk/elevations/index.htm

SRTMGeoTIFFReader.php is the clever file the reads the GeoTiff and converts the elevation values (in meters) into Lat/Lng coordinates.

I doubt this is exactly what you want but it does give you a solid base on understanding the process required to accomplish the task from your question.

(There is too much code to post here)

[GIS] Google Maps Api , PHP, Javascript and Postgresq-Postgis

How can I pass the value from the HTML/JavaScript to the PHP file where I have the connection with database?

If you use jQuery, you can use an AJAX call like this:

$.ajax({
     data: {lat : lat, lng: lng},
     type: "POST",
     url: "script.php",
     success: function (e) {
          alert(e);
     },
     error: function (er) {
          alert("Error: " + er);
     }
 });

And your PHP:

<?php
    $lat = $_POST['lat'];
    $lng = $_POST['lng'];

    //Do what you want with the data, connect to databases, perform queries, etc.  You can then echo back the information from the queries and process the data

    echo 'Your latitude is: ', $lat, ' and your longitude is: ', $lng  //Only an example to show you that the lat/lng params are now in PHP
?>

I know it's a bit vague but this answers your question above regarding how to send data to PHP.

Also, here is a post that has a bit more in regards to posting the information to a PHP for use of querying a database.

Best Answer

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[GIS] How to read GeoTIFF using PHP

[GIS] Google Maps Api , PHP, Javascript and Postgresq-Postgis

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