acgeospatial

A blog on Geospatial 'things'

Orbit - Satellites

What’s in orbit today – Visualised

There are plenty of stunning visualisations of objects in space at present. Starting with this one, updated in 2014 Interactive graphic: Every active satellite orbiting earth Then there is this one – which was displayed at Brighton Data Visualisation recently http://visualeyed.com/cover-story/satellites/ And this one from stuff in space and an ESRI map Plenty has been Read more about What’s in orbit today – Visualised[…]

Earth Observation Sentinel2

Interactive Trackbar to edge detect Sentinel 2 data

The user interface in OpenCV has a Trackbar. This is a really useful feature for interacting with images. By adjusting the slider the user can manipulate the image allowing for the adjustment of threshold values until the image display is optimised. When I wrote about interactive image segmentation I noted one of the critical things Read more about Interactive Trackbar to edge detect Sentinel 2 data[…]

Beginners guide to user Interaction with OpenCV in Python

I have been working with OpenCV for a while now and I still find the speed of results very impressive. It makes for a compelling case for its use in image processing. Computer Vision, at least to me, represents such an incredible opportunity for Remote Sensing specialists as well as non-specialists. I have been meaning Read more about Beginners guide to user Interaction with OpenCV in Python[…]

Image CLAHE Sentinel2

Contrast Limited Adaptive Histogram Equalization (CLAHE) with Sentinel 2a

This week I have been thinking about image stretching. I want to start with a quote taken from the concluding remarks of Image Processing and GIS for Remote Sensing. Image Processing can never increase the information provided in the original image data, but the use of appropriate image processing can improve visualisation, comprehension and analysis Read more about Contrast Limited Adaptive Histogram Equalization (CLAHE) with Sentinel 2a[…]

Interactive Image Segmentation part 3 – Automation

This is the 3rd part in a series on interactive image segmentation. In part 1 I looked at how thresholding an image of coins has the potential to help map circular fields in the desert. In part 2 I applied this watershed algorithm to satellite data and created an output shapefile. In part 3 I Read more about Interactive Image Segmentation part 3 – Automation[…]