Needs Assessment:

Llano County is rural County located in the Texas Hill Country. The Llano County Central Appraisal Districts (CAD) has the responsibility to access and appraise real properties for the purpose of collecting Texas ad valorem taxes. They currently have a digital map and online map that represent the parcels for the County. BIS Consulting maintains the digital map and host that map online through an ArcGIS GIS for Server-Enterprise license.
Llano CAD has identified a need for a light Mobile Field Appraisal application that would allow them to take their parcel map layer into the field with a current imagery base layer and collect a few attributes. Also, a need for photos taken of the improvements of the property during the appraisal process.

Requirements for the Mobile App:

  • The Mobile Field Appraisal app. would allow you to click on a map or query a parcel id and setup a drive route to a parcel.

  • Be able to see key attributes that pertain to a parcel that is being appraised.

  • The ability to populate a few attributes that are needed during an appraisal that are updated later into Computer-Assisted Mass Appraisal Software (CAMA) database.

  • Have base imagery layer with detail to view and identify structures.

  • Be able to take the complete map offline and use in a remote area where you’re unable to connect to cell service.

  • The mobile app would need to work with your mobile device to collect photos of the properties and easily downloaded from the app. and named by parcel id number.

  • A web map that can viewed back at the office that is a working map that would show what properties were completed for appraisal with the name or initials of the field appraiser.

  • Will need two ArcGIS for Collector Level 2 users at Llano CAD for field appraisal staff.

  • Minimum security is needed, data is public domain.

Test Results:

The ArcGIS Collector Application has been tested in the field and meets all the above requirements.  BIS Consulting used a current ArcGIS Online Organizational Account to setup a test in the field with Collector.  A feature layer of the Llano County Parcels was published from ArcMap to the BIS ArcGIS Online Organizational Account.   Two web maps were published, one was dedicated for Collecting connected to cell service and the other for offline collection both pointing to the hosted feature layer.  The purpose being you could use both in your planned day to appraise property in both online and offline mode.

Two iPads were setup with the Collector app.  We identified the parcels that would be in an area with no cell service.  Using Collector we captured the extent of the area with the parcel layer and imagery.  We stored the map offline all this being done connected to the Wi-Fi at Llano CAD.  BIS staff member traveled along with a Llano CAD Appraiser and collected some attributes notes and populated test fields and took some photos at each site.  The information was edited and stored and was later synced when we returned to the office.  We were then able to open the published web maps and view the updates and edits to the Llano CAD working map for field appraisals.

Some of the feedback from Llano CAD Appraisers: The application has great potential for Llano CAD.  It will assist Field Appraisers in planning and routing their appraisal work. Collecting important data in the field and having the ability to manage photos.  Having all the data fields pertaining to the property during the appraisal was a plus.  Assisting new field appraisal staff just getting around the County to all the properties in a timely manner.  Being able to track progress during the field appraisal season and having a working map that can be used to find errors in the field and document and share with BIS for GIS Maintenance to the Llano CAD parcel layer.


The BIS Mobile Map Application has the potential of being a valuable tool to be used in a critical part of the workflow that a Texas Central Appraisal District must perform each year.

Thanks to Darren Sullivent, Senior Field Apprasier Llano Central Apprisal District for testing the application in the field and his feedback.

Contact us about Mobile Field Solutions: (800)247-9045 or

Published On: February 1st, 2021 / Categories: Must Have Services /

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