Everything You Need To Know About CAMA Systems


Property valuation plays a crucial role in the real estate industry, and the accuracy of the assessment is paramount for various purposes, such as taxation, insurance, and transactions. Computer-assisted mass appraisal (CAMA) systems are a vital tool that assists assessors in determining the value of properties. CAMA systems provide a comprehensive solution for assessing properties, automating property appraisal processes, and managing property data.

On this page, Catalis discusses everything you need to know about CAMA systems, including what they are, their features, benefits, and applications. Whether you are a property owner, real estate agent, or assessor, understanding CAMA systems can help you make informed decisions regarding property assessment and management.

Defining CAMAs

Computer Assisted Mass Appraisal systems (CAMAs) or automated valuation models are automated tools utilized for managing information related to properties, their valuations, owner notifications, and ensuring taxation credibility through uniform valuation procedures. CAMAs are employed to optimize limited resources and facilitate the valuation process within the allotted time frame. Additionally, automated valuation models promote objectivity and uniformity, especially when dealing with a large number of properties.

To fulfill the purpose of automated mass appraisals, two main requirements need to be met: ensuring a satisfactory level of predictive capability and accuracy, and providing a valid justification for the predicted property values. These systems utilize computer programs to apply market-derived land rates that vary depending on the property type and the neighborhood, building costs, and depreciation factors that are calibrated to local market conditions based on sales data, building style, grade of construction, and building condition.

Defining Mass Appraisal

There are a variety of both qualitative and quantitative factors that can impact the value of a property, including ownership, size, location, use, physical characteristics, sales price, rents, costs, and operating expenses.

However, conducting individual analyses and appraisals for each property is not practical for ad valorem tax purposes. To address this, a property value system that provides uniformity, accuracy, efficiency, and mass-use capabilities was developed, leading to the emergence of mass appraisals.

In simple terms, mass appraisal involves valuing a group of properties as of a particular date, utilizing common data, standardized methods, and statistical testing to establish a market value for assessment purposes. This process involves the systematic evaluation of the value of a set of similar properties, on a given date, using standardized procedures.

The Data Used In CAMA Generation

Property Characteristics

The features of a property play a crucial role in its categorization, assessment, and other related objectives. The data gathered is dependent on various aspects, such as the factors that affect the local market, providing valid reasoning for the anticipated property prices, complying with the regulations regarding property classification and taxation policies, meeting the requirements of other governmental and private entities, and analyzing the benefits and expenses associated with collecting and preserving each property attribute.

Income And Expense History

The collection of this information is mandatory for properties that generate income. Additionally, certified appraisers must review the data to verify its precision and usefulness for evaluating the property’s worth.


The utilization of different approaches to determine mass appraisals requires the acquisition of sales data. This information aids in the establishment of land values, the creation of depreciation schedules based on market trends, and the computation of capitalization rates or discount rates for application in various valuation methods.


It is essential to maintain cadastral maps, also referred to as assessment maps, tax maps, parcel boundary maps, or property ownership maps, covering the entire jurisdiction, and assigned with a distinct identification number for each plot. These maps must possess precise and current data. The assessors can make use of these maps when implementing Geographic Information Systems (GIS). GIS can exhibit various details such as sale prices, assessed values, inspection dates, work assignments, land uses, and comprehensive analysis of neighboring sales, communities, and market trends.

Cost & Depreciation

Obtaining up-to-date cost and depreciation data that are adjusted to the local market is necessary. Current cost signifies the expense of replacing a structure with one that offers the same level of usefulness, utilizing present-day materials, design, and building standards. It should also incorporate the cost of individual construction components and building items to account for distinct features that differ from the base specifications. On the other hand, land value and accrued depreciation rely on non-cost data and may involve subjective judgment. Frequently, land values are derived from the sale of improved properties. The depreciation schedules can be extracted from sales data in various manners.

Learn More About CAMA Systems

Catalis offers a comprehensive package that includes advanced technology and responsive support to help organizations achieve greater accuracy. With solutions such as CAMA systems that can manage even the most intricate tax and property workflows, Catalis can revolutionize the way your business operates.

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