NAD 27 kapena WGS84 ???

Ngakhale kuti nthawi zina zapitazo, Geographic Institutions ku Latin America adasintha kusintha kwa wGS84 monga choyimira, kusintha kwa mlingo wa ntchito kumakhala kochedwa. Kwenikweni cylindrical ziyerekezo nthawi zonse ndi kusintha yekha kumaphatikizapo kusintha Datum pakati NAD27 ndi NAD83, ngakhale matanthauzo kukhala zovuta kuposa kusamukira yunifolomu mapu vekitala. Zina mwa zifukwa zofunika kwambiri zomwe zimakhudza miyeso ndi izi:

1. Mapulogalamu ambiri omwe alipo kale m'mayiko ambiri a ku Spain ali mu NAD27, ndi mankhwala ochepa apangidwa kuwonetsera kwatsopano. Choncho, chinthu chophweka sichikuvutitsa moyo wanu ndikugwiritsira ntchito chidziwitso m'mafomu omwe amapezeka kwambiri.

2. Zolinga "zojambula" Nthawi zambiri sizimakhudza kugwiritsa ntchito machitidwe onsewa, mbali imene ili yovulaza chifukwa chakuti nthaŵi zina chidziŵitsocho chimakhala “zojambula mapu“. Komabe, ife omwe timagwira ntchito ndi ma municipalities, monga cadastre, gawo lachiwonetsero ndilofunika, ngati mukufuna kuyang'anira mayina a mayina. fungulo la cadastral pansi pa quadrants; popeza magulu onse awiriwa ali osiyana, zomwe zimatanthauza kuti malo amasintha tikasamuka kuchoka ku dongosolo limodzi kupita ku lina. Kuwonjezera apo GPS yatsopano yatsopano siimabweretsa zosankha zonse za NAD27.
2. Ulamuliro umene mautumiki a boma akuwonjezera Zimakhudzidwa ndi kusowa kwa utsogoleri pambali ya mabungwe otsogolera pankhani zojambula zithunzi ndi malo. Ngakhale kusintha amadziwika kwa ziyerekezo latsopano boma kwa zaka zambiri, nthawi zina pamafunika zambiri pang'ono kunena, kuyambira payenera kukhala yapakati-okhudza malo deta kuti akhoza zonse chifukwa pachilichonse ziyerekezo makomiti kasamalidwe dziko. Loss wa utsogoleri m'ma kumene otsiriza, pambuyo usilikali US modzidzimutsa yatulusa amasowa lalikulu m'mayiko ena okha akhala ndi zipangizo kusindikizidwa kapena akamagwiritsa analogi popanda liwiro ku ulendo wawo kuti umisiri yosindikiza kudziwa molingana ndi nthawi.

3. Mfundo yakuti ma kompyuta ambiri alibe vuto deta yosakanizidwa pa ntchentche Zimapangitsa kuti zikhale zosafunikira. Komabe si kokwanira reprojection, nthawi zina m'pofunika standardize zambiri, chifukwa nthawi zambiri zimene zachitika ndi kusuntha sanjira yunifolomu mamita ambiri kumpoto ndipo ambiri kum'mawa vekitala Koma reprojection kumaphatikizapo zambiri kuposa kuti malingana za kukula ndi kufunika kwa deta.

Zingatheke kukhala zovuta kapena zosavuta ndi Google Earth, I am amene akunena zotsatirazi mothandizidwa:

• Kawirikawiri, deta yomwe mumalowera Google Lapansi zimapangidwa ndi dongosolo lapadera loyang'anira malo, monga Universal Transverse Mercator (UTM) ndi datum NAD27 (datum ochokera ku North America wa 1927)

• Pakali pano, Google Earth sichirikiza mafayilo omwe amagwiritsa ntchito ndondomeko ya NAD83.