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Telling Stories Through Maps

Louise White

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Let’s face it.  Unless you are a GIS nerd like me, listening to presentations on data can be very boring.  Fortunately, Esri comes to the rescue with “Esri Story Maps” which allows the casual reader to interact directly with raster and vector data.  According to the Story Map Website, Any user can build and display Esri Story Maps for non commercial purposes for free, or commercially with any type of ArcGIS account.  The user interface is intuitive.  Users can access particular Story Maps and navigate four or five slides, click on some polygons, and display attribute data,


Many stories are well told with maps.  In our case, we throw in a little history as well as give a feel for our products, in this case the US Public Land Survey System or PLSS and all of its complexities.   I know you’ll want to jump right in and see raster and vector examples of a crazy township in Wyoming.

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This StoryMap shows the land grid database sources, processes and uses.
Township 53N, Range 69 West of the 6th Principal Meridian, Wyoming

I am fascinated by the history of the Public Land Survey System, and believe that Story Maps are a good alternative to PowerPoint presenting the history to an audience.  Story Maps can also integrate photos and text to suit most any purpose.

Esri is always making improvements to the Story Map authoring process. When I first started authoring Story Maps a year or so ago, it was sluggish, but since then the workflows have been streamlined and performance has greatly improved.  You will need to invest some hours into your first map, but you will find it time well spent.   Consider Story Maps the next time you want to show management the value and purpose of data, produce an interactive report with geospatial content,  or simply want to make a refreshing change.  Your audience will thank you.


WhiteStar Legal Mapper

For a flat fee, map to infinity.
Two week free trial

Save the date!

Join WhiteStar at the ESRI Petroleum GIS Conference
May 9-10, 2018 | Houston, TX
Booth #400

The Complexity of California Land Survey Explained

Louise White

Jessica Schiewe QA/QC Manager

Jessica Schiewe
QA/QC Manager

The casual observer might wonder, “Why is WhiteStar building Lot, Tract and Quarter-Quarter data in California?  The BLM already has it all, and for free.”  Great question.   Maintained and curated data enable data scientists to perform their analytical duties instead of spending valuable time solving data integrity issues.

 None of the Public Land Survey System (PLSS) data exist in a combined, quality checked or coordinated geodatabase until now. Unfortunately, government agencies don’t communicate well enough among each other - or even have staff to do so -  despite memorandum of understanding agreements.  Duplication of data at various quality levels and vintages abounds.


A story of 3 land grids

CA15 T8N R7E

CA15 T8N R7E

Point data represent BLM_PLSS point data from CadRef_v10.gdb (non-qualifying points, reliability number for corner points in this township exceed 600 feet)

Red lines represent the BLM first division polygons as seen in CadRef_v10.gdb

Green lines represent USFS Surveyed PLSS

Orange lines represent PLSS as seen in DoggrPLSS data

Which one is correct?  Grabbing one arbitrarily makes a 1,000 foot difference. Without knowing the collection and geoprocessing history, it could be the BLM, USGS, Forest Service or none of the above.

WhiteStar Lots, Tracts and Quarter-Quarter Data following the US Forest Service section lines

 
EX1-B.png
 

CA15 T8N R7E as seen within WhiteStar Lots and Tracts - WhiteStar Township/Section data follows USFS Surveyed Data

Sometimes the US Forest Service is right.  In areas where they manage lands, they’re actually an expert source.


Attribute errors and discrepancies between the digital data and source documents exist within the BLM data, reflecting the reality of budgetary constraints and consequent lack of QA/QC.  In the California Department of Oil and Gas (CADOG) data, the PLSS is extrapolated into areas where it has no legal standing.  The US Forest Service has created their own data set, and many counties also have custom coordinate files.


EX2-A.png

CA21 T17S R29E Section 36, LOT 7

Point data represent BLM_PLSSPoint_40_or_under_LL27 (qualifying points)

Grey polygons represent PLSSIntersected feature class from CadRef_v10.gdb database

Labels indicate BLM acres attribute from PLSSIntersected feature class

EX2-B.png

CA21 T17S R29E Section 36, LOT 7

Source image CA21_17s29e_DR.07.05.1985.SID with WhiteStar TOWNSHIP and SECTION feature class AND BLM_PLSSPoint_40_or_under_LL27 (qualifying points) overlays – 1985 Dependent Resurvey shows acreage for LOT 7 as 48.26.

EX2-C.png

CA21 T17S R29E Section 36, LOT 7

Section 36 as seen within WhiteStar California Lots and Tracts – WhiteStar data represents lot acreage as seen on the Dependent Resurvey


We began our project digitizing the US Geological Survey (USGS) 1:24,000 scale maps in the 1990s as it was (and in many cases still is) the industry respected source.  The US Forest Service developed a second version to manage their lands.  In recent years, the USGS began using BLM data on their new DRG maps in the past several years via an interagency MOU.    Finally, the California Department of Oil, Gas and Geothermal (CADOG) created its own version of the PLSS to fill the “holes” that are actually legally valid land grant boundaries or voids left by cancelled surveys.  The land grant boundaries themselves are to be found on the USGS 1:24,000 scale Digital Raster Graphic (DRG) topographic maps.  No one source has it all, and no one source has it all completely or even properly digitized.

In recent years, the BLM has produced the Cadastral component of the National Spatial Data Infrastructure (CAD_NSDI) dataset for California (to replace an old NGDB version - various versions still floating around) that has some subsection lot and tract data.  Many of the corner points are marked with reliability and accuracies ranging from a few feet to (uselessly) many thousands of feet.  Individual county surveyors have yet different digital data sets of corner coordinates known to very high resolution.

We evaluate, integrate, maintain and attribute the various data sources to provide best-of-breed. Each section polygon is tagged with an attribute or geometry update date and its source organization (i.e. WhiteStar, BLM, Forest Service, Other).  We also provide metadata about the different approaches used in different areas in the vast state of California.

The reality of California Land Survey is complex, and resolutions to the challenges have taken many years to solve, and we will be continuously updating subscribers with enhanced data.

WhiteStar Legal Mapper Released

Louise White

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We are pleased to announce new software for mapping your land and lease project data.  WhiteStar Legal Mapper (WLM) is now available as a cloud based “Software as a Service.”  WLM calculates land polygons and well locations based upon legal descriptions in the Public Land Survey System. Quarters, quarter-quarter, and lot descriptions are supported.   Automated metes and bounds mapping and workflow capabilities via the cloud are also under development for release later this year.

Land descriptions can be mapped either singly on WhiteStar Cloud or singly using an add-on button inside ArcMap or  ArcGIS Pro.  WhiteStar Cloud or a Safe Software FME transformer can be used for batch mode calculations.

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Try out WLM Pro with an unlimited two week trial

All four methods reference our pre-loaded data libraries to generate the land polygons. Push a single button inside ArcGIS Pro or ArcMap to plot single polygons on your map.   No pre-existing local land grid installation or loading process is required.  You may map an unlimited number of descriptions without incurring additional fees.

The WLM Plus version adds WhiteStar Streaming Grid and is supported by popular software applications.  The “full meal deal”  WLM Pro version adds streaming access to WhiteStar Lots, Tracts and Quarter Quarter data for one user specified state as well as an API that can be incorporated into your intranet or accessed from another program.  Additional WhiteStar Lot, Tract and Quarter-Quarter  states are also available for licensing.  These states include many states available nowhere else including CO, NM, UT, OK, KS, WY, MT, AR,  ND, LA, MS, and AL.

WhiteStar offers all the software and data necessary to create your business critical, strategic GIS land database for any project.   We have done just this sort of thing for a variety of companies including the Forbes Fortune 200 companies.  WhiteStar will help you to accurately convert land title deeds into maps. We have an internal team of expert mappers capable of mapping even the most complex legal descriptions to help drive your project to completion.

To support the GIS land database creation efforts, WhiteStar offers the most accurate base mapping data including WhiteStar Grid, WhiteStar Lots, Tracts and Quarter-Quarters, WhiteStar Parcels, and imagery.


RESERVE YOUR SPOT!

The Houston GIS Petroleum User Group Social sponsored by WhiteStar, is on Wednesday, January 17th! Click here for more information.