ICAR AICE-JRF/SRF (PhD) — Subject 59 Forestry · India · National Testing Agency for ICAR
Original practice questions written to the published syllabus · not past papersReading the forest from above: aerial photographs and satellite images, spectral behaviour of vegetation, image classification, change detection and forest-cover monitoring.
In the exams: IFoS Forestry Paper II Section A (forest mensuration and remote sensing); ICAR AIEEA-PG Group 09 (aerial photo interpretation and remote sensing); ICAR AICE-JRF 59 Unit 4
How our questions for ICAR AICE-JRF/SRF spread across the units of Remote Sensing & Photogrammetry for Forestry. Difficulty: 0 easy, 17 medium, 20 hard.
| Image classification: supervised and unsupervised; accuracy assessment | 5 | |
| Radar (SAR) in forestry | 5 | |
| Vegetation indices (NDVI and others) | 4 | |
| National forest-cover monitoring systems | 4 | |
| Electromagnetic spectrum and spectral signatures of vegetation | 3 | |
| Aerial photographs: scale, stereoscopy, parallax and tree height | 3 | |
| Photo-interpretation keys for forest types | 3 | |
| Forest cover and change detection | 3 | |
| Fire detection and burned-area mapping | 3 | |
| Satellite sensors and resolutions: spatial, spectral, temporal, radiometric | 2 | |
| Drones (UAVs) for forest survey | 2 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
The 'red edge' in a vegetation spectrum is:
C. The steep rise in reflectance from red to NIR
Its position shifts to shorter wavelengths when chlorophyll falls or the plant is stressed.
Why is the relief displacement method of height measurement poorly suited to closed-canopy forest?
A. Tree bases are hidden
The displacement d is measured from base to top, so the base must be visible; parallax is preferred in closed canopy.
An elimination (dichotomous) interpretation key:
A. Leads from general to specific choices
Like a botanical key; selective keys instead present examples to match.
Photo-interpreted stand maps are most directly used in forest inventory to:
C. Stratify field plots
Strata of similar type, density and height reduce sampling error; see forest-inventory-sampling.
Omission error for a class is the complement of:
B. Producer's accuracy
Omission is the share of reference samples of the class that the map missed.
Commission error for 'forest' is:
A. Mapped forest that is not forest
Commission error is the share of map 'forest' that the reference data show is not forest: the map committed it wrongly to the class. It is 1 − user's accuracy. Forest that the map missed is omission error, the complement of producer's accuracy.
A drawback of post-classification comparison for change detection is that:
C. Errors of both maps combine
It does give from-to classes, but its accuracy is limited by both classifications.
Which polarisation is generally most sensitive to forest biomass?
D. Cross-polarised HV
Cross-polarised backscatter comes from volume scattering in branches and foliage.
Flooded forests and mangroves often appear bright in L-band HH images because of:
C. Double-bounce scattering
Signals bounce between trunks and the smooth water surface back to the sensor.
Collect Earth and SEPAL, promoted by FAO, are tools for:
D. Sample-based and cloud-based forest monitoring
Visual interpretation of sample plots on high-resolution imagery and cloud processing.
Ten here, 37 in the app. The Laisha app has every practice question we have written to ICAR AICE-JRF/SRF in this subject, marked as you go, with timed papers, a jump-to-unanswered list and a certificate when you pass at 70 per cent.
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