CRST Cheat Sheet 2026: One-Page Review of Must-Know Facts

Identity Check: Which CRST This Sheet Covers

Several unrelated credentials share the acronym "CRST," so start by confirming you are studying the right one. This cheat sheet covers the Certified Remote Sensing Technologist (CRST), offered through the American Society for Photogrammetry and Remote Sensing - Imaging & Geospatial Information Society (ASPRS). The technologist identity is explicitly named on printed page 14 of the ASPRS Certification and Recertification Guidelines. It is a different designation from Certified Mapping Scientist, Remote Sensing, and the two have separate examination matrices. If you need background on the name itself, see What Does CRST Stand For? or What Is CRST Certification?.

Fast Facts at a Glance

Here is the one-page core. Everything below is expanded in later sections, but this table is the part to print and pin to your wall.

Two items in that table are deliberately marked unverified: the question count and the passing mark. Rather than guess, check the latest ASPRS materials and your Prometric appointment instructions. Our CRST passing score guide tracks what is and is not publicly confirmed.

Eligibility and the Experience-Rule Conflict

This is the single most important "gotcha" for new applicants. ASPRS documents disagree about how experience is counted:

• Printed page 13 (detailed technologist requirements): three years of total experience, including two years in the specialty.
• The overview, the current landing page, and the application: three years in the specialty.

These are not the same rule, and this sheet does not declare either one the winner. Until ASPRS clarifies, treat the stricter reading (three years in the specialty) as the safer planning assumption, and contact ASPRS before you pay a nonrefundable fee. Document your work history in a way that satisfies both readings: list remote sensing duties, dates, and supervisors clearly so your references can corroborate them.

Application Steps and Fees

The CRST application is more than a form and a payment. The process has four moving parts that all must be satisfied before you sit for the exam:

1. Four references. Choose people who can speak to your remote sensing work and professional conduct.
2. Ethics compliance. You must meet the program's ethics requirements, which ties directly to the Professional/Ethical focus area on the exam.
3. Peer review. Your application is reviewed before approval.
4. Examination approval. Only after approval can you schedule with Prometric.

On cost, there are two separate charges: the ASPRS application fee ($200 member, $395 non-member, nonrefundable) and the Prometric testing charge, which is billed separately. Because the fee gap between member and non-member is $195, it is worth checking whether ASPRS membership changes your total outlay. The CRST certification cost breakdown walks through the full budget, including retake and recertification costs.

Exam Format, Delivery and Allowed Materials

The exam is a secure computer-based written examination delivered by Prometric, either at a testing center or through remote proctoring. You receive results immediately, and the maximum time is two hours. That is a tight window for a test whose majority emphasis is a single broad domain, so pacing matters.

Remote-proctor rules from the handbook

• One bound reference is permitted.
• A handheld calculator is permitted.
• A writing device and scratch paper are permitted.
• You must use a personal computer, not an employer-issued or government-issued one.

That last rule trips people up. Corporate and agency laptops often have security software, restricted permissions, or monitoring tools that conflict with remote proctoring. Plan to use a personal machine and run any system check Prometric provides well before test day.

Because one bound reference is allowed, choose it deliberately. A reference organized around remote sensing principles, sensors, and image interpretation will serve you better than a general geospatial textbook. For realistic expectations about difficulty, see How Hard Is the CRST Exam?.

The Ten Focus Areas on One Page

The technologist column of the ASPRS examination matrix lists ten focus areas. These are examination focus areas, not a preparation curriculum, so use them to decide where to spend time rather than as a syllabus of lessons. Here are all ten with their printed values:

For a deeper walkthrough of each area, the complete guide to all 10 CRST content areas goes domain by domain.

Why the Percentages Need Careful Handling

Add up the printed numbers and you get 112%, not 100%. That is a published discrepancy in the source matrix, and it is not something this article can fix. Because of this, treat the percentages as directional signals only:

• Remote Sensing is clearly the dominant focus area.
• Photogrammetry and GIS/LIS are printed at 0% for the technologist column.
• Seven other areas are printed at an equal, much smaller value.

The 0% rows deserve a note. A printed 0% suggests Photogrammetry and GIS/LIS are not tested as standalone focus areas for the technologist, but that does not mean the concepts never appear in context. Remote sensing work naturally touches geometry and spatial data. Treat them as background literacy, not study priorities.

Remote Sensing: What to Master First

With the largest printed allocation by a wide margin, Remote Sensing is where your score is made or lost. The matrix gives the focus-area name rather than a topic list, so use the following as a self-assessment checklist of what a working technologist should be fluent in, and verify against your own reference material.

Resolution questions are a reliable theme in any remote sensing exam, so be able to reason about them, not just define them. For example, practice explaining why a sensor with fine spatial resolution but coarse spectral resolution may be a poor choice for a vegetation-health question. Test yourself on scenario reasoning with the CRST practice tests, which help you see where your applied understanding is thin.

Supporting Areas: Lidar, UAS, and the 6% Group

Seven focus areas share an equal printed value of 6%. Individually small, together they carry meaningful weight, and they are where candidates with a narrow background lose points. Think of them as the foundation under the main domain.

Since a handheld calculator is permitted in the remote-proctor rules, comfort with quick calculations (scale, ratios, unit conversion) will save time under the two-hour limit.

Retakes, Deadlines and Recertification

The program runs on firm clocks, so build them into your plan from day one.

• First attempt: due within six months of application approval. Do not let approval sit unused.
• Retake: one retake is allowed within six months of the first attempt, and it carries another testing charge.
• Recertification: every three years, requiring 60 documented PDHs (or PDH credits), four references covering the preceding three years, and an application fee of $125 for members or $325 for non-members.

Only one retake is allowed within that window, so treat the first attempt as the real attempt. Scheduling details and testing availability are covered in the CRST exam dates guide. For what the results look like in aggregate, see what the data shows on CRST pass rates, and keep in mind that ASPRS has not publicly confirmed the passing mark we could verify.

A Domain-Ordered Review Schedule

Generic study habits matter less than sequencing. Because the percentages are under a verification hold, this schedule orders topics by relative emphasis and dependency rather than exact proportions. Adjust the length to your timeline; for a fuller method, see the CRST study guide.

Remote Sensing gets the longest block because it carries the largest printed allocation, and the foundations come first because sensor behavior is hard to reason about without the physics underneath it. If you are unsure whether the credential is worth the effort, the ROI analysis and the salary guide can help you decide before you pay the application fee.

Frequently Asked Questions