{"@context":"https://schema.org/","@type":"Quiz","dateCreated":"2026-07-24T14:06:23.305Z","dateModified":"2026-07-24T14:06:23.305Z","typicalAgeRange":"11-18","educationalLevel":"AP PGECET","assesses":"Geo Engineering and Geo Informatics - Radiometry","educationalAlignment":[{"@type":"AlignmentObject","alignmentType":"educationalTopic","targetName":"Radiometry"},{"@type":"AlignmentObject","alignmentType":"educationalSubject","targetName":"Geo Engineering and Geo Informatics"},{"@type":"AlignmentObject","alignmentType":"educationalExam","targetName":"AP PGECET"}],"name":"Quiz about Radiometry","about":{"@type":"Thing","name":"Geo Engineering and Geo Informatics - Radiometry"},"hasPart":[{"@type":"Question","eduQuestionType":"Multiple choice","learningResourceType":"Practice problem","educationalLevel":"intermediate","name":"Question About Radiometry","text":"In remote sensing, what does a Digital Number (DN) represent?}","encodingFormat":"text/markdown","comment":{"@type":"Comment","text":"Remember:\n\n\\[\n\\boxed{\n\\text{DN}\n\\rightarrow\n\\text{Quantized digital sensor value}\n}\n\\]\n\nRadiometric calibration converts DN values into physical quantities such as radiance or reflectance."},"suggestedAnswer":[{"@type":"Answer","position":0,"encodingFormat":"text/markdown","text":"

Actual physical radiance value with units

","comment":{"@type":"Comment","text":"\"\""}},{"@type":"Answer","position":1,"encodingFormat":"text/markdown","text":"

Continuous analog signal from the sensor

","comment":{"@type":"Comment","text":"\"\""}},{"@type":"Answer","position":2,"encodingFormat":"text/markdown","text":"

Quantized digital value of the detected signal without physical units

","comment":{"@type":"Comment","text":"\"\""}},{"@type":"Answer","position":3,"encodingFormat":"text/markdown","text":"

Geographic coordinates of a pixel\n\n

","comment":{"@type":"Comment","text":"\"\""}}],"acceptedAnswer":{"@type":"Answer","position":2,"encodingFormat":"text/markdown","text":"

Quantized digital value of the detected signal without physical units

","comment":{"@type":"Comment","text":"Remember:\n\n\\[\n\\boxed{\n\\text{DN}\n\\rightarrow\n\\text{Quantized digital sensor value}\n}\n\\]\n\nRadiometric calibration converts DN values into physical quantities such as radiance or reflectance."},"answerExplanation":{"@type":"comment","text":""}}}]}

In remote sensing, what does a Digital Number (DN) represent?

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The Correct Option is C

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