The Texas Highland Lakes offer beautiful scenery along with some great recreation opportunities. This series of lake contour maps was developed while learning to generate map tiles. The lake contours are viewable on a Leaflet map. Each Highlanf Lake is a layer that can be viewed individually or along with the other lakes. The map tiles were generated using QGIS with the QMetaTiles plugin. All source data was provided by the Texas Water Development Board.
Please note that the Highland Lakes contour maps are general reference and are NOT FOR NAVIGATIONIONAL USE.See the Map
The Geolocation API Specification is a W3C Recommendation that provides access to a device’s geolocation through scripting. The API provides two methods for accessing a device’s geolocation and can be used for data collection that includes positional information in the form of latitude and longitude. While easy enough to implement, the API can be a bit challenging without a solid understanding of how it works. This article explains some of the less discussed aspects of using the Geolocation API in an effort toward a better implementation.Read More
Most digital cameras save JPEG images with metadata. This tool shows the metadata associated with an image taken with a digital camera. Don't worry, the photo and its metadata are not uploaded to any server. A client-side script does all the work.Read More
It is somewhat traditional when extracting features from a layer to select features using a selection expression based upon a specific attribute value and save the selected features to a new layer. This example will show one way to automate the Extract by attribute tool using the QGIS Processing Framework to develop a custom script that will split a layer using unique values from dialog interface.Read More