Assessing the Quality of the Modelling of Continuous Variables in the 2D Domain – A Deterministic Approach See Part 1 and Part 2 of the ‘Measuring the Quality of Predictions’ discussion. Distribution of Uncertainty Unfortunately, limiting the analysis of uncertainty to the magnitude of the residuals alone is proven to be too limited an approach.…
Read detailsAssessing the Quality of the Modelling of Continuous Variables in the 2D Domain – A Deterministic Approach See Part 1 of How can I measure the quality of my predictions? Estimating Prediction Quality through Validation Whilst a geostatistical approach to the interpolation provides the user with a direct estimate of the errors of the predictions, this…
Read detailsIf you’re an ArcGIS Desktop user you might be interested to know that there are a number of keyboard shortcuts available to speed up frequently used operations and save you some mouse mileage: ArcGIS Desktop 9.1, 9.2 and 9.3 Tips and Shortcuts ArcGIS Desktop 10 Tips and Shortcuts My personal favourite is F9 – stop drawing!…
Read detailsAssessing the Quality of the Modelling of Continuous Variables in the 2D Domain – A Deterministic Approach Background Any quick search on Google on the subject of “Assessing the quality of models in the 2D domain” would provide tonnes of results, with a number of them referring to research papers proposing various ways to evaluate…
Read detailsRecently someone asked me how to use ESRI well symbols for bullets in MS Word documents and MS PowerPoint Presentations. Initially my first thought was to make a screen grab of the well symbol using Paint or Snagit, a useful utility software. This would provide a small image of the symbol that would be ideal.…
Read detailsWith the imminent arrival of ArcGIS Server 10 and its template-based online spatial data editing it looks as though map-based crowdsourcing (which has been around for a while via Google Earth etc.) will soon be a reality for the ESRI community. ESRI themselves have quite a neat example of this available on their website, monitoring the…
Read detailsWhen you start up a new ArcMap document, you almost immediately and probably unknowingly lock yourself into using either relative or full folder paths: A relative folder path specifies the location of files brought into the project in relation to where you have saved your ArcMap document for the project. A full folder path specifies…
Read detailsIn GIS terminology a ‘mask’ is a spatial layer that one uses to limit the ‘view’ of a region. For example, if you were looking at the geology of the North Sea region, but only really interested in the marine environment you might employ a ‘land mask’. This would be a polygon that lies on…
Read detailsI was very interested by a recent blog by David Bamford on the subject of behavioural economics. The bottom line is that buyers of technology are fickle and not altogether objective when it comes to buying new technology, for a variety of very human reasons: Benefits are only realised sometime in the future Benefits are…
Read detailsInternational oil and gas companies are presented with so many exploration opportunities that they cannot all be actively pursued. In order to decide where to commit resources the exploration opportunities need to be analysed and ranked (preferably as quickly as possible), based upon the quality of each opportunity and the risks (geologic, engineering and economic) associated…
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