写出arcgis工具箱脚本：输入数据，然后根据图斑里其中一个字段的值相同、去把面积小于多少平方米参数值的图斑合并到相邻的图斑里去，在导出合并后的成果。

以下是一个简单的ArcGIS工具箱脚本示例，可以实现上述要求：

import arcpy

# 定义输入参数
input_fc = arcpy.GetParameterAsText(0) # 输入要素类
field_name = arcpy.GetParameterAsText(1) # 用于合并的字段名称
area_threshold = arcpy.GetParameterAsText(2) # 面积阈值

# 定义输出参数
output_fc = arcpy.GetParameterAsText(3) # 输出要素类

# 创建空间查询对象，用于查询每个图斑
spatial_ref = arcpy.Describe(input_fc).spatialReference
spatial_query = arcpy.SpatialReference(spatial_ref)

# 创建一个字典，用于存储相邻图斑的ID
adjacent_dict = {}

# 遍历每个图斑，将其添加到相邻图斑的列表中
with arcpy.da.SearchCursor(input_fc, ["OID@", "SHAPE@", field_name]) as cursor:
    for row in cursor:
        fid = row[0]
        shape = row[1]
        field_value = row[2]
        if field_value not in adjacent_dict:
            adjacent_dict[field_value] = []
        for adj_fid, adj_shape in adjacent_dict[field_value]:
            if shape.touches(adj_shape):
                adjacent_dict[field_value].append((fid, shape))
                adjacent_dict[field_value].append((adj_fid, adj_shape))
                break
        else:
            adjacent_dict[field_value].append((fid, shape))

# 创建一个空的要素集合，用于存储合并后的图斑
merged_features = arcpy.CreateFeatureclass_management("in_memory", "merged_features", "POLYGON", input_fc, spatial_reference=spatial_ref)
merged_fields = arcpy.ListFields(merged_features)
for field in merged_fields:
    if field.name not in ["Shape", "SHAPE", "SHAPE@"]:
        arcpy.AddField_management(merged_features, field.name, field.type, field.precision, field.scale, field.length, field.aliasName, field.isNullable)

# 遍历相邻图斑字典中的每个字段值
for field_value in adjacent_dict:
    # 遍历相邻图斑列表中的每个图斑
    for fid, shape in adjacent_dict[field_value]:
        # 如果该图斑没有被合并过，则进行合并
        if fid not in [f[0] for f in arcpy.da.SearchCursor(merged_features, ["OID@"])]:
            # 计算该图斑的面积
            area = shape.getArea("PLANAR")
            # 如果面积小于指定阈值，则将其合并到相邻图斑中
            if area < float(area_threshold):
                adjacent_shapes = [adj_shape for adj_fid, adj_shape in adjacent_dict[field_value] if adj_fid != fid]
                merged_shape = shape.unionAdjacent(adjacent_shapes)
                with arcpy.da.InsertCursor(merged_features, ["SHAPE@"] + [f.name for f in merged_fields if f.name not in ["OID", "Shape", "SHAPE", "SHAPE@"]]) as cursor:
                    cursor.insertRow([merged_shape] + [row[1] for row in arcpy.da.SearchCursor(input_fc, [f.name for f in merged_fields if f.name not in ["OID", "Shape", "SHAPE", "SHAPE@"]], "OID = {0}".format(fid))])
            # 否则，将该图斑添加到合并后的要素集合中
            else:
                with arcpy.da.InsertCursor(merged_features, ["SHAPE@"] + [f.name for f in merged_fields if f.name not in ["OID", "Shape", "SHAPE", "SHAPE@"]]) as cursor:
                    cursor.insertRow([shape] + [row[1] for row in arcpy.da.SearchCursor(input_fc, [f.name for f in merged_fields if f.name not in ["OID", "Shape", "SHAPE", "SHAPE@"]], "OID = {0}".format(fid))])

# 将合并后的要素集合保存为输出要素类
arcpy.CopyFeatures_management(merged_features, output_fc)

该脚本会在工具箱中创建一个工具，用户可以通过该工具选择输入要素类、用于合并的字段名称、面积阈值和输出要素类，然后运行工具即可实现图斑合并的功能。