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Errors in the DEM contributed about 9 mm of noise to the coseismic offset estimates obtained by Massonet et al. ( 1993 ) , where rms vertical errors in the topographic data were estimated after the fact to be about + / -24 m. Systematic errors in selected areas can , of course , be much larger than this . They are found in grassy , sandy areas and are common in Anoka , Washington , Sherburne , Benton , and Stearns counties . Black areas indicate low radar correlation . Geranium rust is a foliar disease affecting plants in the genus Pelargonium , including cultivated geraniums . Susceptible vegetables include carrots , onions , potatoes , and tomatoes . New infections may also originate from spores produced on newly purchased geraniums . Susceptible vegetables include carrots , potatoes , onions and tomatoes . They have been reported to damage roots of corn , potatoes , strawberries , sweet potatoes , and various grasses . The recent Kobe earthquake in Japan hints at the magnitude of disaster when a large earthquake strikes an urban center . Geranium rust , unlike many rust fungi , completes its entire life cycle on geraniums . We envision a SAR mission capable of two separate modes of operation : ( a ) a monitoring mode in which global coverage is offered to guarantee that " before " pictures are available in all areas of interest with reasonable repeat times ; and ( b ) a rapid-response mode to allow acquisition of " after " pictures shortly after an event of interest . Stem rot may also develop , producing water-soaked or blackened areas on the stem near the soil line . Rust spores can blow through window screens , so indoor geraniums may become infected . Before purchasing geraniums , inspect the leaves carefully for rust pustules and yellow leaf spots to avoid purchasing infected plants . l. Foliar nematode produces a wedge-shaped lesion in hosta and other monocots .