Category Archives: Blog

DateMar 12, 2021
The R&H Pathologies
Today, I finally published the R&H Pathology LinkedIn blog series’s last installment with support from his colleagues and friends in the GIS-T community. I am immensely grateful to receiving comments...
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GIS Alchemy: Generating LRS Event Boundary Polygons
In most DOTs, various types of boundaries are expressed and managed as LRS events.  The following table shows how ADOT records maintenance district boundaries. District Name Organization Name Route From...
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DateAug 6, 2020
Optimizing ArcGIS Dashboards: 250,000 Linear Features in Under 3 Seconds!
ArcGIS Dashboards is known for its great map user interface and ease of design and deployment.  After successfully building the ADOT bridge dashboard with 13,000 point features in ArcGIS Dashboards,...
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DateJun 15, 2020
Towards Geocoding LRS Events
Address geocoding and LRS dynamic segmentation (dynseg) are two commonly used processes that yield geospatial coordinates for plotting and spatially analysis.  To me, the key difference between the two lies...
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Building the Magic Layer – Secret Sauce Unveiled
Route reference does NOT represent a new data model nor is it a new Linear Referencing Method (LRM); it is an addon object to any existing LRS model. Governed by...
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Stabilizing LRS Castles – Shifting Sands Ignored
[It seems that as GIS-T professionals, we are cursed to build or maintain LRS castles on sand dunes to fulfill the LRS promise of integrating and managing all transportation events...
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DateMay 26, 2020
Humanizing LRS – Coin Stories Told
In the 2020 TRB Annual Conference, Patrick Whiteford of ADOT and Shawn Blaesing of IaDOT led the discussion on the proverbial LRS question – “Measure or XY” – by presenting...
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DateMay 15, 2020
Measuring Data Quality in ADOT
Behind the ubiquity of data disclaimers is the realization that our data is not perfect and that pursuing perfection is akin to boiling the ocean.  But are we satisfied with...
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Discovering ArcGIS Dashboards: Map as a First-Class Citizen
The ADOT MPD’s (Multimodal Planning Division) journey in search of GIS/LRS data visualization technologies started 6 years ago.  The key mission was to produce  dashboards that were Sustainable – automated...
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DateJun 11, 2017
Calibrating Routes with FME – An FME UC 2017 Hackathon Challenge
FME Hackathon was one of the highlights of this year’s FME User Conference in Vancouver, BC.  Second on the Hackathon challenge list was “LRS Calibrator”; it was perhaps the most...
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FME for HPMS Reporting Challenges
Whether you are glad that the HPMS season will be ending soon, or stressed that the deadline is looming, or both, you owe it to yourself to check out FME-based...
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DateJan 14, 2016
Go Beyond Overlay – Embrace the Join!
Relating LRS events/assets from different datasets by their common spatial or spatiotemporal existence is one of the LRS professional’s most desired capabilities.    Software vendors’ answers to this have been variations...
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Beyond the Straight Line Diagram
The one-dimensional nature of Straight Line Diagrams (SLD) makes them ideal for viewing the relationship of many LRS features along a common dimension, the route measure.  However, even with the...
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Reinventing the Straight Line Diagram
Straight Line Diagrams (SLDs), also known as Route Logs or Strip Maps, are an effective way to visualize different features and characteristics that co-exist along the same stretch of roadway....
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DateApr 16, 2015
LRS QC (Quality Control): What Are We Looking For?
Having authoritative LRS data sources is high on the agenda of any transportation agency. But let’s face it, most data administrators admit that the quality of their LRS data is...
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Supporting Local Roads LRS with Route Reference Table
The ARNOLD requirements pose many challenges, one of which is how to identify or reference local roads where mileposts do not exist, or for which driven mileage is not recorded....
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