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Georectification of aerial images, such as thermal, photographic and satelite data to enable map overlay in all GIS systems.

Aerial infrared heat loss surveys and therma-spatial analysis allowing colour-banding of infrared data for easy identification. 

Both new and old survey data can be brought to life.

Historic aerial photographs can be digitised and seamlessly joined together for hard-copy or digital presentation.

Geo-rectification is the process of aligning graphical data on a two dimensional surface so that it accurately corresponds with a map projection system. 

Hotmapping.co.uk specialise in georectification services and typically align layers such as aerial photographs, satellite imagery (landsat) and infra-red data.

All location based data can be turned into maps, colour coded and georeferenced whether it be imagery or statistical data.

Once georeferenced the data can be installed in a GIS system allowing direct comparison with other layers within the application.  Typically, these layers include:

  • Map Data

  • Aerial photographic images

  • Information layer - such as an address database

  • User specific data such as topography, infra-red and landsat data

  • Statistical data such as earnings, energy use and population information.

The rectification process is detailed and complex.  Each image is rectified individually, using multiple GCPs (Ground Control Points) to accurately align the input image with the reference image.  A transformation matrix can then be computed allowing the input image to be resampled to match the map data.

Ground images can be overlaid with elevation drawings or photographs for precise identification of problem areas.


Step 1  Formatting the image and map data ready for georectifying.


Step 2  Using multiple Ground Control Points, individual images are aligned with the map data.


Step 3  The rectified images are joined together to form a seamless mosaic.


Step 4  The combined image map is projected using map co-ordinates so that it can overlay the map data in your GIS software.


Individual images are then stitched together to form a mosaic - a map of images - that can be viewed over the original map data.

Analysis of thermal data can be hugely simplified with our therma-spatial analysis system. 

The above screenshot is taken from a GIS system and has been created by taking the average pixel value of each building from the thermal data and attributing a colour banding to it.  This enables at-a-glance identification of problem properties which are either losing significant amounts of heat or may be inadequately heated.  We believe that 8 colour codes achieve the right balance between detail and simplicity, but this can be increased or decreased according to requirements.

All our geo-rectification is carried out in-house - unlike many service providers we do not out-source abroad.  This allows us, and our customers, to control the process from start to finish, and if any discrepancies arise in alignment, they can be rectified (so to speak) immediately.

For more information, please call us on 01263 722655 or contact us here.


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