Author: eduKate Asia
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PSLE Science Reality Lab Vol No.456 | “HDOP = 0.8” — Does That Mean the GPS Error Is 0.8 Metres?
A Primary 5/6 Reality Lab guide to reading HDOP on GPS/GNSS displays: separate satellite-geometry dilution from metres of position error, then test the wider evidence before trusting an accuracy claim.
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PSLE Science Reality Lab Vol No.455 | “This Fluorescence Image Is Bright Green” — Were the Cells Naturally Green?
A Primary 5/6 Reality Lab guide to fluorescence-image pseudocolour: separate measured signal from display colour, check channel labels and scaling, and avoid treating a scientific image palette as the specimen’s natural colour.
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PSLE Science Reality Lab Vol No.454 | “Orthorectified Image” — Is Every Pixel Now in Exactly the Right Place?
A Primary 5/6 Reality Lab guide to orthorectified imagery: learn what terrain and sensor-geometry corrections improve, what residual registration error can remain, and how to evaluate map-image position claims.
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PSLE Science Reality Lab Vol No.453 | “NoData = −9999” — Did the Sensor Measure Minus 9999?
A Primary 5/6 Reality Lab guide to NoData and fill values: learn why −9999 can mean missing or invalid data rather than a physical measurement, and how metadata, valid ranges and masks protect scientific reasoning.
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PSLE Science Reality Lab Vol No.452 | “11 Spectral Bands” — Is That Sensor Automatically Better Than One With 4?
A Primary 5/6 Reality Lab guide to evaluating spectral-band claims: why 11 bands are not a universal sensor quality score, and how to compare wavelength placement, band width, spatial detail, calibration, timing and scientific purpose.
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PSLE Science Reality Lab Vol No.451 | “Swath Width = 185 km” — Does One Satellite Pixel Cover 185 km?
A Primary 5/6 Reality Lab guide to reading satellite swath width correctly: why 185 km describes observation coverage, not one pixel, and how to separate coverage from spatial resolution, scene size, revisit timing and scientific usefulness.
