A Three-Band Hand-Held Radiometer for Field Use

Abstract

A self-contained, hand-held radiometer designed for field use has been constructed and tested. The 4.5-kilogram device, consisting of a strap-supported electronics module and a hand-held probe containing three sensors, is powered by flashlight and transistor radio batteries, uses two silicon and one lead sulfide detector, has three liquid-crystal displays, features sample-and-hold radiometric sampling, and is spectrally configured to Landsat-D's thematic mapper bands TM3 (0.63 to 0.69 micrometer), TM4 (0.76 to 0.90 micrometer), and TM5 (1.55 to 1.75 micrometers). The device was designed to collect ground-truth data for the thematic mapper and to facilitate ground-based, remote-sensing studies of natural materials in situ. Prototype instruments were extensively tested under laboratory and field conditions, with satisfactory results.

Evaluating a hand‐held crop‐measuring device for estimating the herbage biomass, leaf area index and crude protein content in an Italian ryegrass field

“…To overcome the saturation effect, previous studies applied a log‐transformed target variable or exponential model to fit the relationship between the NDVI and the LAI or BM (Tucker et al . ; Viña ; Erdle et al . ).…”

An introduction to `upside-down' remote sensing

“…For example, Cardenas et al (2008) use a handheld infrared camera to demonstrate the thermal heterogeneity of fl uvial systems, whereas used the same type of imager to locate the warmest sections of rail track prone to buckling. Indeed, due to the higher spatial resolution available, it is not uncommon to use a groundbased technique to verify, or ground truth, satellite estimates (Tucker et al, 1981). For example, satellite measurements of vegetation can be verifi ed using high-resolution, ground-based equipment (eg, Pontailler et al, 2003;Chapman, 2007).…”

The use of remote sensing in light use efficiency based models of gross primary production: A review of current status and future requirements

“…Since the mid-1980's there has been an increase in the development of physical approaches to determining f PAR , due partly to global diagnostic studies using satellite data (Tucker and Sellers, 1986), plot scale field studies (Asrar et al, 1984;Tucker et al, 1981), large field experiments (Sellers et all., 1992;Hall et al, 1992;Sellers et al, 1997;Running et al, 1999) and theoretical work (Myneni et al, 1992;Hall et al, 1990;Sellers 1985;1987;Sellers et al, 1996a,b). This research formed the basis for physical models of canopy reflectance, transferring reflectance and biophysical property relationships from the leaf level, where they can be easily measured and related to leaf composition and structure, to the pixel level, where leaf optics interact with canopy structure, understorey characteristics, background reflectance, view and illumination geometry to produce a complicated relationship among pixel-level reflectance, stand structural, biophysical and leaf optical properties .…”