diff --git a/lib/io/dsv_io.cpp b/lib/io/dsv_io.cpp
index a8a7701..44c1403 100644
--- a/lib/io/dsv_io.cpp
+++ b/lib/io/dsv_io.cpp
@@ -951,15 +951,8 @@ void gctl::geodsv_io::fill_column_point2dc(const array<point2dc> &data, int xid,
     std::string s;
     for (size_t i = 1; i <= std::min(row_num_, (int) data.size()); i++)
     {
-        ss.clear();
-        ss << data[i - 1].x;
-        ss >> s;
-        table_[i][xid].str_ = s;
-
-        ss.clear();
-        ss << data[i - 1].y;
-        ss >> s;
-        table_[i][yid].str_ = s;
+        table_[i][xid].value(data[i - 1].x, p);
+        table_[i][yid].value(data[i - 1].y, p);
     }
     return;
 }
@@ -982,20 +975,9 @@ void gctl::geodsv_io::fill_column_point3dc(const array<point3dc> &data, int xid,
     std::string s;
     for (size_t i = 1; i <= std::min(row_num_, (int) data.size()); i++)
     {
-        ss.clear();
-        ss << data[i - 1].x;
-        ss >> s;
-        table_[i][xid].str_ = s;
-
-        ss.clear();
-        ss << data[i - 1].y;
-        ss >> s;
-        table_[i][yid].str_ = s;
-
-        ss.clear();
-        ss << data[i - 1].z;
-        ss >> s;
-        table_[i][zid].str_ = s;
+        table_[i][xid].value(data[i - 1].x, p);
+        table_[i][yid].value(data[i - 1].y, p);
+        table_[i][zid].value(data[i - 1].y, p);
     }
     return;
 }
@@ -1018,20 +1000,9 @@ void gctl::geodsv_io::fill_column_point3ds(const array<point3ds> &data, int rid,
     std::string s;
     for (size_t i = 1; i <= std::min(row_num_, (int) data.size()); i++)
     {
-        ss.clear();
-        ss << data[i - 1].rad;
-        ss >> s;
-        table_[i][rid].str_ = s;
-
-        ss.clear();
-        ss << data[i - 1].lon;
-        ss >> s;
-        table_[i][pid].str_ = s;
-
-        ss.clear();
-        ss << data[i - 1].lat;
-        ss >> s;
-        table_[i][tid].str_ = s;
+        table_[i][rid].value(data[i - 1].rad, p);
+        table_[i][pid].value(data[i - 1].lon, p);
+        table_[i][tid].value(data[i - 1].lat, p);
     }
     return;
 }