![3
+What is the VisibilityFilter Attribute?
Database enrichment that represents results of a generalization
process
Intend to implement with 9 benchmark scales; focus on 1:100K and 1:250K
Defines the smallest applicable scale of use for a feature within TNM
datasetes
‘Level of Content’ vs. ‘Level of Detail’
Draft Model Definition:
The VisibilityFilter attribute represents appropriate use of individual features through scale. The
attribute does not reflect capture conditions. Data are captured per respective scale-specific
specifications. The VisibilityFilter attribute is intended only to direct appropriate end use of the data. A
given VisibilityFilter coded-value indicates that the object is appropriate for use at approximately the
defined scale and all larger scales [i.e., an object with a given VisibilityFilter is not appropriate for use
at scales smaller than the defined approximate scale]](https://image.slidesharecdn.com/stauffernacis20161020-161028210834/85/Enabling-Users-to-Easily-Filter-TNM-Datasets-to-Smaller-Scales-3-320.jpg)
![4
+Defining the VisibilityFilter
SELECT *
FROM [dataset]
WHERE VisibilityFilter >= [scale denominator]](https://image.slidesharecdn.com/stauffernacis20161020-161028210834/85/Enabling-Users-to-Easily-Filter-TNM-Datasets-to-Smaller-Scales-4-320.jpg)
![8
+Methodology: Airports
SELECT *
FROM AirportPoint
WHERE AirportPoint.VisibilityFilter >= [scale denominator]
AND AirportRunway.VisibilityFilter < [scale denominator]
INNER JOIN AirportPoint ON AirportRunway.FAA = AirportPoint.FAA
Measure and group length of features (apply minimum and
maximum length restrictions)
Mimic feature collapses and dimensionality changes through table
joins](https://image.slidesharecdn.com/stauffernacis20161020-161028210834/85/Enabling-Users-to-Easily-Filter-TNM-Datasets-to-Smaller-Scales-8-320.jpg)
Enabling Users to Easily Filter TNM Datasets to Smaller Scales
- 1. + Enabling Users to Easily Filter TNM Datasets to Smaller Scales Andy Stauffer [email protected] NACIS Colorado Springs, CO October 20, 2016
- 2. 2 +Agenda Introduce the Visibility Filter attribute Scope, purpose, and defining the Visibility Filter Generalization workflows Organizing generalization decisions - ScaleMaster Visibility Filter examples Hydrography Roads Airports Evaluating preliminary results Topo TNM Style Template Enriching the 1:24,000 scale design Enabling 1:24,000 scale data for 1:100,000 mapping
- 3. 3 +What is the VisibilityFilter Attribute? Database enrichment that represents results of a generalization process Intend to implement with 9 benchmark scales; focus on 1:100K and 1:250K Defines the smallest applicable scale of use for a feature within TNM datasetes ‘Level of Content’ vs. ‘Level of Detail’ Draft Model Definition: The VisibilityFilter attribute represents appropriate use of individual features through scale. The attribute does not reflect capture conditions. Data are captured per respective scale-specific specifications. The VisibilityFilter attribute is intended only to direct appropriate end use of the data. A given VisibilityFilter coded-value indicates that the object is appropriate for use at approximately the defined scale and all larger scales [i.e., an object with a given VisibilityFilter is not appropriate for use at scales smaller than the defined approximate scale]
- 4. 4 +Defining the VisibilityFilter SELECT * FROM [dataset] WHERE VisibilityFilter >= [scale denominator]
- 5. 5 +Formalizing generalization decisions: Developing a ScaleMaster ScaleMaster developed by NGTOC employees Brittany Roche and Seth Webinger, FY2016
- 6. 6 +Methodology: Hydrography Leverage existing generalization tools Remove content based on estimated Upstream Drainage Area Data is generalized to all scales from the source High Resolution National Hydrography Dataset (star generalization)
- 7. 7 +Methodology: Roads ; from Brewer et al. 2013 Gradually remove features based on network length (ladder generalization) Leverage pre-existing Functional Road Class hierarchy to prioritize generalization
- 8. 8 +Methodology: Airports SELECT * FROM AirportPoint WHERE AirportPoint.VisibilityFilter >= [scale denominator] AND AirportRunway.VisibilityFilter < [scale denominator] INNER JOIN AirportPoint ON AirportRunway.FAA = AirportPoint.FAA Measure and group length of features (apply minimum and maximum length restrictions) Mimic feature collapses and dimensionality changes through table joins
- 9. 9 +Topo TNM Style Template Part of an ongoing effort to “Cartographically Enable TNM Data” ArcMap Map Document (.mxd) file Contains US Topo symbology and layering Contains US Topo-like labeling Contains US Topo-like map marginalia Configurable to any location where TNM data is available Obtainable from TNM Download Portal 7.5’ US Topo ArcMap specifications Configuration instructions http://viewer.nationalmap.gov/tools/topotemplate/
- 10. 10 +Topo TNM Style Template: Use at 1:24,000 scale The Topo TNM Style Template is set up to mimic the design of the US Topo product The 1:24,000 scale content is shown at its native scale The content is clearly displayed and only minor symbology / labeling problems exist in a fully automated fashion
- 11. 11 +Topo TNM Style Template VisibilityFilter to enrich map design Topo TNM Style Template Default VisibilityFilter – Enriched Design
- 12. 12 +Topo TNM Style Template Scale reduction to 1:100,000 Zooming out in the Topo TNM Style template mimics a photoreduction of the map The data and labels are linked to the source, 1:24,000, scale. All 1:24,000 scale content is visible but illegible
- 13. 13 +Topo TNM Style Template: Rendering map at 1:100,000 By changing the display scale to 1:100,000, the content becomes overwhelming All 1:24,000 content is still visible, but too dense to generate a clear map
- 14. 14 +Topo TNM Style Template: VisibilityFilter to reduce scale
- 15. 15 +Accomplishments and Future Work Accomplishments VisibilityFilter attribute prototyped in many TNM feature types Generalization framework for implementing VisibilityFilter attribute has been mocked up for two benchmark scales Cartographic use of TNM data can be used fairly easily at smaller scales in Topo TNM Style Template Future Work Continue to evaluate use of VisibilityFilter in other feature types, especially boundaries Evaluate how to extrapolate results to an additional seven benchmark scales (1:50K to 1:5M) Document ‘best practices’ for cartographic use of TNM data at smaller scales, perhaps with simplification information
- 16. + Enabling Users to Easily Filter TNM Datasets to Smaller Scales QUESTIONS Andy Stauffer [email protected] NACIS 2016 Colorado Springs, CO October 20, 2016