আমরা নির্ধারিত সময়ের মধ্যে অফিসের কাজ শেষ করে চূড়ান্ত রিপোর্ট জমা দেই। Naturally, to determine distinctions in elevation amongst two details, the contour interval, or length in altitude between two adjacent contour lines, has to be acknowledged, which is normally stated within the map key. Ordinarily contour intervals are regular https://contoursurveyinbangladesh62848.blog-kids.com/32399150/5-essential-elements-for-contour-survey-in-bangladesh