List of Contributions

Sam Roberts

MapInfo Pro 17 Beta
Summer '18 Map Entry

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RE: MapInfo Monday: Hill Shading

Posted By Sam Roberts 11-21-2023 16:08
Found In Egroup: MapInfo Pro \ view thread
Hi Peter, Another technique with shadow I have always found useful is to use it to highlight the edge of raster cells. To do this you need to use nearest neighbor interpolation so that there is only a shadow on the edge of cells where there is an abrupt change in data value. It helps you to see the ...

Multispectral Satellite Imagery Processing

Posted By Sam Roberts 08-11-2023 00:29
Found In Egroup: MapInfo Pro \ view thread
In 2019 and 2020 I wrote two articles in this forum that described experimental work I was doing to pre-process Landsat and Sentinel2 multispectral imagery using virtual raster technology and then to display that imagery in MapInfo Pro using rendering algorithms. After leaving Precisely in 2020, I ...

RE: Conversion of mrr to grd - issues to use files in older/other tools

Posted By Sam Roberts 05-09-2023 01:42
Found In Egroup: MapInfo Pro \ view thread
VM grid files store data as an integer which can either be 16-bit or 32-bit. There are scale & offset values that transform your floating point data to integer for storage, and convert the integer back to floating point when you load it. Pro always writes using 32-bit integers and this is not compatible ...

RE: Raster Rendering Deep Dive – Part 1 – Default Algorithms

Posted By Sam Roberts 04-21-2023 16:16
Found In Egroup: MapInfo Pro \ view thread
Hi Duri, I don't believe you can specify which band is the alpha band in the GHX file. If you have four (or more?) bands that are not named Red Green Blue Opacity then the ECW driver will not assume it has RGBA data. If you have four bands it will create two fields - the first is an Image field using ...

Exploring the Gulf of Mexico Bathymetry for Christmas Infotainment!

Posted By Sam Roberts 12-04-2022 19:15
Found In Egroup: MapInfo Pro \ view thread
If you can drag yourself away from your Netflix Christmas Rom-Com Movie Marathon, here is an alternative video to provide some Christmas infotainment! I explore a high-resolution bathymetry raster, developed by the BOEM by stitching 3D seismic survey data together in the Gulf of Mexico. We have been ...

RE: Edit classified Raster

Posted By Sam Roberts 11-08-2022 17:31
Found In Egroup: MapInfo Pro \ view thread
One other option, and I am not suggesting it is a good one for a second, is to use the raster calculator operation. I tested it on a small classified raster in MRR format and it worked. If your raster is in Vertical Mapper GRC or GeoTIFF format that is an additional unknown. You can use an expression ...

RE: Seamless table v21 Vs v15

Posted By Sam Roberts 11-02-2022 04:59
Found In Egroup: MapInfo Pro \ view thread
Hi Matt, The only VRT files I have to test are some TIFF images that are geolocated and warped using a VRT. They work in MapInfo Pro v21. You ought to check your MapInfo Pro Raster Preferences in the backstage area and make sure that the GDAL VRT format is enabled for processing and display. ...

RE: Seamless table v21 Vs v15

Posted By Sam Roberts 10-28-2022 15:57
Found In Egroup: MapInfo Pro \ view thread
The key difference is that when you open a raster in v21 it keeps the file open and uses a Windows file handle. Each process only gets about 2000 file handles so if you try to open more than 2000 rasters you run out of handles. When this happens, the engine will probably crash. Also, each raster tile ...

Landsat pre-processing

Posted By Sam Roberts 07-11-2022 21:41
Found In Egroup: MapInfo Pro \ view thread
I have been trying to come to grips with Landsat scene pre-processing. Landsat science is a constantly moving target - a spice with many tastes - a dizzying array of textures...and moments... Anyway, it is confusing and takes effort to keep abreast of. Maybe this video will help. If you want to display ...

ProRaster Essential - Advanced raster rendering software for MapInfo Pro

Posted By Sam Roberts 07-10-2022 22:56
Found In Egroup: MapInfo Pro \ view thread
I am pleased to announce that you can now purchase ProRaster, my new raster rendering software for MapInfo Pro, from the Microsoft Store! It currently ships in two tiers - Essential and Premium. Get started by downloading the free evaluation version - search for "ProRaster Essential Free" on the Microsoft ...

RE: Exploring the ESA World Cover Land Use Raster

Posted By Sam Roberts 05-25-2022 19:53
Found In Egroup: MapInfo Pro \ view thread
Hi Jay, You can use the raster plugin in the latest version of MapInfo Pro to create some kinds of MVR virtual rasters. However, this only covers some of the ground and there are other kinds of MVR that are undocumented. I know how to write them because I wrote the code originally. At this time, as ...

RE: Exploring the ESA World Cover Land Use Raster

Posted By Sam Roberts 05-25-2022 19:52
Found In Library: Mapinfo Pro

Exploring the ESA World Cover Land Use Raster

Posted By Sam Roberts 05-24-2022 23:58
Found In Egroup: MapInfo Pro \ view thread
The European Space Agency released a new raster dataset last year called WorldCover. It is a 10-meter resolution global land cover classified raster derived from Sentinel-1 and Sentinel-2 satellite multispectral data. I downloaded the dataset from AWS S3 and took a look at it in MapInfo Pro and ProRaster. ...

Video Series: Modern Raster Technology Explained

Posted By Sam Roberts 03-27-2022 22:42
Found In Egroup: MapInfo Pro \ view thread
I have prepared a series of four videos and articles that explain modern raster technology. My motivation is to shed some light on the raster engine that sits inside MapInfo Pro, which I helped design and build. These are not "How to..." videos - they are "What's under the hood" videos. In a sense, ...

RE: Unable to created classified raster legend

Posted By Sam Roberts 03-03-2022 19:04
Found In Library: Mapinfo Pro

RE: Unable to created classified raster legend

Posted By Sam Roberts 03-03-2022 19:04
Found In Egroup: MapInfo Pro \ view thread
A little update to this: I downloaded a portion of the dataset, but when you download the entire dataset it behaves differently. To use the same MVR trick on the full dataset you need to add some driver preference directives to force the TIFF driver in MapInfo to load the raster a certain way. The ...

RE: Unable to created classified raster legend

Posted By Sam Roberts 03-03-2022 15:42
Found In Egroup: MapInfo Pro \ view thread
Hi Jane, There is a mechanism to load a GeoTIFF file as a Classified file. What you need is a GDAL PAMDataset auxiliary file (otherwise known as a raster attribute table or RAT file). If you have a TIF file called "LCM.TIF", then this auxiliary file would need to be called "LCM.TIF.AUX.XML". It would ...

RE: Unable to created classified raster legend

Posted By Sam Roberts 03-03-2022 15:41
Found In Library: Mapinfo Pro

RE: Gridding LiDAR Bathymetry Data in MapInfo Pro

Posted By Sam Roberts 02-22-2022 20:50
Found In Egroup: MapInfo Pro \ view thread
Hi Peter, You could get LASTools from here and run the LASINFO tool that is included. Open a CMD window and do something like "lasinfo *.las" and it will spew out information. If the gridding stops it is probably failing to open the LAS file, so it might be corrupted or not a real LAS file or something. ...

How to use MRR Rasters in QGIS on Windows using GDAL

Posted By Sam Roberts 02-16-2022 17:50
Found In Egroup: MapInfo Pro \ view thread
If you want to use QGIS to display or process MRR format rasters, or you want to share MRRs that you have created with clients or colleagues who use QGIS, you (the QGIS user) will need to install the MRR GDAL driver. I have recently gone through this process and I have shared an article and a video on ...