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Re: [gis-lab] -2
- From: Sergey Tchikunov <oldflint@xxxxxxxxx>
- Subject: Re: [gis-lab] -2
- Date: Wed, 7 Jul 2004 16:41:05 -0700 (PDT)
Ôîòîøîï äåéñòâèòåëüíî ïîêàæåò òàê íàçûâàåìîå (îá ýòîì äàëåå) ÷åðíîå ïîëå áîëüøå, ÷åì ArcView. Äåëî
â òîì, ÷òî ëþáîé ðàñòðîâûé ôàéë (âêëþ÷àÿ ãðèäû) íà ñàìîì äåëå èìååò ÒÎËÜÊÎ ïðÿìîóãîëüíóþ ôîðìó,
ïðîñòî â ArcView îáû÷íî ÷èñòûé ÷åðíûé öâåò (backgraund) îòêëþ÷àåòñÿ.
Èòàê â Ôîòîøîïå âûáèðàÿ öâåò ïåðà ìîæíî ïîñìîòðåòü (â öèôðå) êàêîé îí íà ñàìîì äåëå ÷åðíûé öâåò
(255,255,255). Ìîæíî âûäåëèòü îáëàñòü ðàñòðà, êîòîðàÿ â ArcView äîëæíà ñòàòü ïðîçðà÷íîé, è, çàëèòü
åå ÷èñòûì ÷åðíûì öâåòîì. ÍÅËÜÇß ÌÅÍßÒÜ ðàçìåðû ðàñòðà, òàê êàê ôàéë ïðèâÿçêè .tfw íå ñìîæåò
ïðàâèëüíî óñòàíîâèòü êîîðäèíàòû â ArcView.
Òàêîå âîçìîæíî ñ òðåõñëîéíûìè ðàñòðàìè (â ArcView), à ñ øåñòè è áîëåå ñëîÿìè ÿ ðàáîòàë ïî äðóãîìó:
 ArcView äåëàë stack?è â tiff?û, â Ôîòîøîïå îáðàáàòûâàë êàæäûé ôàéë ïî îòäåëüíîñòè ? stack1.tif,
stack2.tif è ò.ä., çàòåì â ArcView ñîáèðàë mozaik. Imagine äëÿ ýòîé ðàáîòû ïðîñòî íå ïðèìåíÿë,
õîòÿ òàì åñòü äëÿ ýòîãî âñå.
Êñòàòè, åñëè Âû íå ïðèìåíÿåòå èíäåêñèðîâàíèå ðàñòðîâ, ïðîùå è ýêîíîìíåå â ñìûñëå äèñêîâîãî
ïðîñòðàíñòâà õðàíèòü ôàéëû â MrSID-ôîðìàòå, â êîòîðûé ìîæíî ýêñïîðòèðîâàòü â òîì æå Imagine.
Íàïðèìåð: l53129.gis ? 35Mb, l53129.sid ? 8Mb.
Ñåðãåé
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