该文以湘中杨市镇清代大宅民居为研究对象，结合实地测绘调查和文献阅读对其进行专项研究。
Taking Dazhai residences as the study subject , linking with on-the-spot mapping materials and historical literature to study .
掌上型GPS可以快捷准确地进行野外实地查勘获工程测绘，以及船测调绘作业，在生产与生活中得到了广泛的应用。
Palm GPS can rapidly and accurately conduct field location-survey to get engineering mapping and conduct boat measurement annotation, widely used in daily life.
掌上型GPS可以快捷准确地进行野外实地查勘获工程测绘，以及船测调绘作业，在生产与生活中得到了广泛的应用。
Palm GPS can rapidly and accurately conduct field location-survey to get engineering mapping and conduct boat measurement annotation, widely used in daily life.
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