In my previous posts (part 1 and part 2), I described how ArcMap warns users that a coordinate transformation is required and some potential pitfalls to be aware of. In this post, I will explain how to set a coordinate transformation in ArcMap. How to Select a Coordinate Transformation Open the Geographic Coordinate Systems Transformations…
Read detailsIn my last post (part 1), I described two scenarios when ArcMap undertakes coordinate operations, commonly known as “on-the-fly projection”. In the second scenario, the user must select a valid coordinate transformation to ensure map layers are correctly aligned. In this post, I will outline how ArcMap informs the user a coordinate transformation is required…
Read detailsAs mentioned in a previous blog, ArcMap can correctly align layers of geographic data with different spatial reference (also called ‘coordinate reference system’ or ‘CRS’) properties within the same data frame. This so-called “on-the-fly projection” leaves source data unchanged – it does not permanently change it in any way whatsoever. Using this functionality, companies avoid…
Read detailsIn the plenary session of Esri’s PUG Conference 2011 they showed a video from Anadarko discussing GIS and introducing their ‘iMaps’ web-based GIS solution. In the video Anadarko explained that their philosophy was to provide ArcGIS Desktop for GIS-savvy users, and the web-based GIS ‘iMaps’ for basic use across the enterprise. Choosing the right tools…
Read detailsInvestigating the Correlation Between Formation Pressure and Depth using ArcGIS Determining whether or not two or more continuous variables are correlated in space or time and quantifying the nature and the strength of this correlation is a type of data analysis which is common in many fields including physical geography, environmental studies and earth sciences. In…
Read detailsIn ArcGIS Desktop selecting features is often an essential step before copying, modifying attributes, changing geometry, or merging features. But when using layers with multiple overlapping polygons it’s often not easy to select the polygon you want. Let’s assume that I have a layer with many overlapping polygons and I want to select a particular…
Read detailsWe often need to use editing tools for digitising a new object such as a point, line or polygon feature. These are fairly straightforward to create, but one of the problems with polygons is that we sometimes need to create a new one alongside an existing one. Let us suppose we have a scanned map…
Read detailsFor a while now Esri’s ArcMap has had the ability to add ‘hatches’ to line layers, enabling you to post labelled measurements along lines (for further information see the ArcGIS Desktop 10 help on linear referencing and dynamic segmentation). The main applications of this in oil and gas are posting shot point labels along 2D…
Read detailsAlthough there are numerous formats for exporting your finished map to, Portable Document Format (PDF) files are possibly the most useful. These files allow users to share high quality cartographic outputs with both a level of security and some flexibility of display. It is also a popular format for delivery to commercial printers, for sharing…
Read detailsIn a blog last year we posted an ArcGIS Explorer 1200 add-in that allowed you to create 3D KML representations of feature layers. We have now updated the add-in for ArcGIS Explorer 1500 and posted it for download @ Esri’s ArcGIS.com site. For further information see the following resources: 3D Extruder add-in User Guide for ArcGIS Explorer 1500 Ross Smail’s original…
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